The mechanic stated that I have an empty fap tank and the reason is that it is leaking. The tank was refilled a year ago. At that time I was told that it is leaking slightly, so it looks like a small leak, since it has passed for over a year. The question now is whether such tanks can be repaired because looking at the Allegro it looks like plastic, so for example a hot soldering iron should seem to do the job at a negligible cost. Can he do it or not because the new tank is terribly expensive?