DCC 900 Audio drop outs - input and play

Hi,

I bought DCC 900 in a good condition. It had problems playing caused by the leaking capacitors and replaced. Both boards are clean with little signs of corrosion. Cleaned up. Nothing major.
Recapping definitely worked.

BUT
I have regular audio drop outs. Audio drops for a millisecond or so once per second.
I connected the optical input and I have the same audio drop outs even when not recording! The deck is in record pause and sound drops every second or so. The display shows drops input signal .
The recording works (with the drop outs) and plays (adding even more drop outs).

Has anyone had this issue? Can you point me where to look?

Videos of the issue:
Input drop outs
Play drop outs

Thanks,
Eugene.