IIRC TP15 is front & center on the PCB. Look at the bottom of the
chassis for a darkened spot from the xistor overheating. Its
a small xistor.
The part # listed for TP15 may be the old or new number. IIRC there
is still an old RCA parts distributor with NOS parts. They should have
a bin full of them. Sry I dont remember there name.
good luck es 73 Zeno
LFOD !