First check the main B+ that feeds the horz stage. Must be right on.
The PCB is probably marked. Typical 130 VDC.
Those caps rarely go bad. Markings are the value, last number is
zeros. Ex 623 is 62000 in mfd or pf. Caps around the hoz / HV are
critical & must be the same values & type or you may blow things.
Odds are its another 'lytic but check it for cold joints in horz and
main power supply.
good luck
73 Zeno
LFOD !