Check
R401/R402, both should read ~680 ohms out of circuit.
R403/R404, both should read ~10 ohms out of circuit.
Do a diode check on D401, D402, D403, and D501. D401 is a full-wave bridge, so there are really 4 diodes in that case, you will need to test all 4.
R308 should be a .22 ohm...