I don't normally touch this sort of thing, But a local guitar shop that i do repairs for asked a favour as they brought it working then it failed

This acoustic has low output. Not pickup or battery. Injected a signal and i can see it til it gets to i ic called 4062
This unit has 3 ic all with different numbers on
signal seems to get going into pin 1 and 2
any assistance ??

have a good day people