Hello everyone!

I'm seeking help regarding my Creative Sound Blaster 16 CT2290. When I acquired it a few weeks ago, it was working perfectly fine.
However, about a week ago, I began noticing occasional garbled sound coming from the FM output only (first noticed during the Prince of Persia title screen).
Then it completely stopped working, but only the FM sound; the digital audio (8-bit and 16-bit) remained unaffected.

What could be the possible cause of this issue? Could it be due to bad solder joints or faulty capacitors?
This is the only Sound Blaster I have with an OPL3 chip, and since it's not Plug and Play, I'm really keen on finding a way to revive it somehow.

Thanks!