HHB repair dilemma

I have an HHB CDR 850 which began to act funny earlier this year. It began to
intermittantly not recognize valid CDRs and then began refusing to enter record
mode and/or to finalize discs. I took it to a local repair shop but they were
unable to repair it and suggested factory repair. I located the closest repair
shops (all of which are more than 100 miles away) and was told by one shop that
it was likely a repair that would cost $750 -$900. Another place guessed at
about $350-$500. This seems exhorbitant to me for a unit that originally cost
$1100. I hate to just give up on having it fixed.
Can anyone recommend a reputable and honest repair shop that works on HHB CDR
units. I guess distance from me is not much of an object because it will
apparently have to be shipped in any event. However, I am near San Francisco.
Thanks for any help,

Garth~


"I think the fact that music can come up a wire is a miracle." 
  Ed Cherney