Sure they help- they'll sell you a new one!
If they didn't "code protect" that PIC, you could find another amp of the exact same revision and clone the chip. But it's dicey that you'd find one and unlikely they'd have left it unprotected.
Realistically, these components are not in the power stage, that would have been a more straightforward repair. If they're visibly damaged, then the 5V logic supply was probably fried, so everything fed off that line could be damaged, visible or not.