Apple //c+ Disk Drive Repair

[chris@invalid.com (CHRIS MORSE)]

I got an Apple //c+ on eBay a while ago, and I had no 3.5" bootable
disks, but was able to plug in an external 5.25" drive and boot from
that.

Recently, I got some 3.5" ProDOS 8 bootable disks.  I put the disk in
the drive and booted up fine, into the ProDOS utilities program.
Being clever, I decided that the best thing to do, right away, was to
start making backup copies...  (I also have an external 3.5" drive
that I plugged in.)

I went to the Copy Disk function and it asked me to write-protect the
disk before copying it.  So I did that.  While it was copying, it
started complaining about read errors on certain tracks/sectors.  So I
aborted the disk copy.  

But apparently it still corrupted the original 3.5" disk, as I can't
boot from it anymore -- I just get an error like "UNABLE TO LOAD
PRODOS".

Anyhow, I figure there's something definitely wrong with the internal
3.5" drive -- is there anything I can do myself to repair or replace
the drive?  Any Apple II shops out there that will fix it for a fee?
I recall reading that there was a place still around-- maybe in Hawaii
or something like that.  Can't recall though, and I didn't find
anything (yet) in the FAQ's... still looking..

If fixing myself, is there any way to replace the internal 3.5" drive
with some Macintosh model drive?

Thanks for any help,...

// CHRIS