With the high density components it is really easy to mess something up. Likely some other component was damaged by too much heat, physical damage, etc.
The old saying "If it isn't broken, don't fix it" applies here. Opening up one of these radios is really risky, modifying it more so.
Sending it in for repair will likely not go well. For one, it will be expensive, two, since you have modified the radio, any sort of warrantee is void. The FCC type certification on the receiver portion is now void also.
Of course the legal issues as well, voided type certification (part 15) on the receiver, not using a properly certified radio on frequencies you may not be authorized to use, doesn't meet requirements for Part 90, GMRS, FRS, MURS, Marine VHF (part 80) etc.
If you are legally licensed, you should be using the correct radio for the job.
None the less, you've learned what many have, they make it look easy in the pictures, but when you open up a radio like this it's really easy to damage it. You might be able to take a close look inside and find something you can fix, but unless you have experience with SMT soldering, this usually leads to more problems. I rarely even attempt to do SMT work, I just don't have the experience, tools or steady hands to do it correctly.
Likely your best move at this point will be to either buy a new FT60 and leave it as is, or do the right thing and get a proper radio for the frequencies you are licensed for, maybe look at one of the Chinese Wonder Radios that they sell so cheap.