I bought a broken MDP-800 yesterday. The seller said there was no audio. I opened it up and was greeted with the following:
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The following caps were leaking:
Servo section: C299, C428, C430 47uF (I have seen these leak in a MDP-600 as well)
Audio section: C507 47uF
Power section: C707 100uF
Power supply: C31 C35 100uF
All of these capacitors were 35V.
After cleaning up all the leakage and replacing these, there was still no audio. +8VDC to audio section was somewhere around +2VDC. I replaced the +8V regulator in the power supply and was relieved to hear audio.
On to the adjustments now (once I find wherever my MDP adjustment cable is hiding). Unless the mechanical adjustments have drifted, it shouldn't take long since the only servo adjustments available are tilt balance for A and B.