Trip the main breaker and look at the SE cable lugs. Check L/N and L/L.
With the service disconnect open you avoid back circuits from the other phase and the house loading down the connections back to the pole. If the voltage is nominal then, suspect a bad connections at the meter or back towards the pole. If you were dropping 32 volts in the main breaker or lugs, I would expect it to be pretty hot. If you have zero on the bad leg now, it is open back to the transformer