Start at 9-155-01 CRT socket. See the big flat pack of resistors ?
Check PC under that. Also the rest of the board.
It can also be on the 9-160 or 9-152.
Dont think this had it but the next chassis had a double sided PCB
for the customer controls that caused it also.
While you are in there change the 10mfd 315V cap at the right rear
of the 9-160. You may want to check the PC cons on the
whole board but its been replaced so probably OK.
73 Zeno
LFOD !