if i may, here's 3 options...
1)
If your unit is still under warranty period, better bring it back to where you bought it, para less hassle sa time & effort, wala pang bayad (usually).
2)
But if you bought it 2nd hand, maybe its best you ask the previous owner if it's still under warranty, then do option 1.
3)
if its past the warranty period, you have 3 choices...
3.1) do kalikot on your gear, with the previous suggestions by our fellow forummates. or
3.2) if you're not up to doing kalikot on your gear, still bring it to any music shop that can repair it (JB music for instance), & pay the service/parts amount.
i think its ok, at least less hassle, in case any problem after you test it, at least a back-job will not cost anything. or
3.3) some expert-philmusic-techies might be of help, at a lower price i think.
just a thought...
hope you have your unit fixed, ok din yan zoom. great unit. for users before stepping-up to higher gear calibre.
br