On 30/04/2018 8:39 PM, Ivan Vegvary wrote:
Reilly, both diodes have a removable lead going to the xformer. The bodies are press fit into a copper plate. Do I simply unplug and check for current direction with ohmeter?

Sounds like a half wave rectifier, there would be 3 wires from the
tranny. If the diodes are the same you would need to make sure they were
the same polarity as the previous diodes.