Needing Help! SAE Two A-14 audio amp problem

[bucklin]

My electronics tech is having trouble fixing an SAE Two amplifier
model A-14. It has no audio output. If he shorts across the speaker output
circuit protection relay the audio works fine. He has a good service manual
but can't track down what the problem is. Does anyone know what the
problem may be specifically? It was repaired for the same problem by another
tech and the repair didn't last long. I do know that 4 ohm speakers are a no-
no. He's testing with headphones or 8 Ohm speakers. Sure would appreciate
some help here. No audio noise (thump). Does anyone know where I can get this relay in case that is the problem? Please no advice on cleaning contacts. Please eMail me directly at [email protected].
Harvey