LG k10 (2017) M250n Post-Liquid Contact: Center Speaker Not Working Despite Successful Tests

Hello.
Telephone after contact with liquid. Initially, he did not react, but after a bath in the washer he managed to start it, the display was replaced because the touch did not work and there was water in the middle of the LCD. All functions of the phone work as they should. The speaker works (you can hear the caller), after connecting the headphones, everything is ok. The microphones work.
The problem is that with the center loudspeaker (buzzer), it does not work completely and is functional because I checked it on another phone, also after the creation of any new effects. As you get it to your ear it sometimes can be heard noise when playing audio. The tape connecting the speaker with the board has smooth transitions, there is no break through to the housing.
What could be the reason? Which element can be responsible for this state of affairs? What can I check?

Adds photos to the motherboard.

The area marked in black will most likely be the reason for the lack of sounds. The inductors look completely rotten.

sm233 wrote:

The area marked in black will most likely be the reason for the lack of sounds. The inductors look completely rotten.

Thank you for your response.
I could mislead this photo. The elements look very good. These are flux residues.
After cleaning, it looks like this.


Added after 14 [minutes]:

I noticed that there is a transition on the board between the speaker contacts. Should it be like that?

Added after 19 [hours] 9 [minutes]:

I will add photos where there was corrosion.
Corrosion after 3 days, after contact with the liquid from the phone was immediately removed the battery.

sm233 wrote:

The area marked in black will most likely be the reason for the lack of sounds. The inductors look completely rotten.

The chokes have been checked and are in working order.

Will I get a schematic of the motherboard somewhere? Maybe someone has and would like to share.