Quoted from Foxxstone_80:Would TP3 reading above the recommended rate be a sign of an issue or is that an acceptable number?
243V a TP3 is within range.
Is the 3/16 amp fuse at FU8 also blowing? If not, try disconnecting one leg from the C2 electrolytic capacitor and see if the fuse stops blowing on power up. The side effect of C2 being disconnected is the displays will strobe providing the high voltage circuit is otherwise working.