Yes, in my experience with these decks, it is almost always the
regulator board. I can scan and e-mail you the schematic of the power
supply/regulator board tomorrow. In the meantime, I suggest you take
the board out (there are about 20 cables to disconnect. Once the board
is out, I would recheck all the fuses on that board, and any other
fuses you see on the board next to it.