Promariner battery charger, Ferro Resonant failure

Buddy Roger had a Promariner 80 amp 3 bank charger that quit on his boat. We think the electrical hi jinks that follows a code compliant rewire caused by rebuilding the docks after the Missouri river 2011 flood might have killed it. Code now requires GFI breakers at the power post which is an ongoing problem. Most boats on the docks have problems. Roger has two refrigerators and  air conditioning which give the GFI's fits.
The short version is the transformer failed so it is time to get a new charger.

Testing showed 2 volts out of the transformer open circuit and 21 volts across the capacitor. Rectifiers tested good as did the circuit breakers. Tried substituting larger and smaller caps but no joy.  Promariner has good trouble shooting information at
http://www.pmariner.com/troubleshooting_chargers.php
The transformer has failed. Better to get a new charger.