Concrete mixer broke a Brother HL-3140CW. 09 Error : Need Maintenance Software & SQWAVE.PJL File

Hi all. Hope someone can please help me with a situation where a concrete mixer broke my mother's printer... Long story short, some construction people working at my parent's house fixing some things brought in a concrete mixer that would take the whole house's power down when turned on.... After many attempts with the same result (mains RCDs would aggressively trip instantly...), the mixer was taken back to get fixed. It turned out, from what they told me, there was a short in it, that's why the breakers would trip.... So after a few days my old father needed to print some stuff and the printer, an old (everything here is old....) Brother HL-3140CW would give a 09 error, which after some research means irregular power supply.... Pretty sure it was the concrete mixer was the cause as this printer has been here forever without major problems so it would be too much of a coincidence... I also suspect the power supply could still be ok and it was just unstable mains, as the concrete mixer was constantly shutting it down as the workers tried to turn it on...
Anyway, I already found the service manual and I think my best shot, before changing the low supply voltage board, would be to just reset the "irregular power supply detection counter"...

After reading parts of the service manual I realized some software and files are nowhere to be found.... (lost long hours after it....):
- FILEDG32.EXE
- Brother maintenance USB printer driver MaintenanceDriver.zip
- SQWAVE.PJL file

I did manage to find filedg32.exe on some file sharing site, assuming it doesn't contain a virus....
Also found the maintenance driver but my antivirus would constantly attack and delete it, so that's either a false positive or probably a virus...
Couldn't find sqwave.pjl anywhere....
The rest I can manage, I'll probably install a virtual machine and get some Windows XP version on it just to try to fix the printer...
So please, if anyone has or knows someone that has these files, please post here...
Thank you!
AI: Just to be sure, what operating system and computer hardware are you planning to use for running the maintenance software and drivers (e.g., Windows XP on a VM, or something else)?
Planning on using a VM with Windows XP
AI: Have you already tried any other troubleshooting steps with the printer itself, like power cycling, factory reset, or plugging it into a different power outlet, or is this your first attempt at fixing it?
Yes, tried power cycling and a reset

The content of the topic looks like an introduction to sci-fi doctoring.... What about the hens, a damaged concrete mixer didn't cause a drop in egg laying?....
If there is a problem with the power supply (which we don't know) then you need to measure voltage stability, ripple. If you don't have the means to do this (multimeter and oscilloscope) then you should buy a working power supply from fellow members of this forum, there are 2 specialists here who know the Brother subject inside out and have a technical background.
I can't remember for this model of printer - if there is a relay in the power supply then it would be a good idea to check its contact, it is possible that it has burned out.
The motherboard could also be damaged. If you push whatever you can find on the internet with a name that suits you, you won't even see the content on the LCD.

If you are looking for the full softwares, please contact me by pw.

Drivers are available here
https://www.brother.co.uk/support/hl3140cw/downloads