Oh so close, but now what (new problem)

[DaveWM]

ok the usual suspects will be that plus the items the other items mentioned.

does the 3.3uf cap get hot before the circuit breaker kicks off? if it does get hot its prob bad.

If not then I would try disconnecting the horz out transistor (remove it from the socket). if it still kicks on then you need to start checking things like filter caps and diodes in the power supply.