[TenTec] Omni VII ATU Saga

[Curt]

My Omni VII arrived in good condition after a trip to the factory to repair 
a broken internal ATU.  It seems to be working fine, the tuner works as well 
as it did when new.

What puzzles me is Ten-Tec's note about the repair says "replaced defective 
455 filter in transmitter chain.  Labor $150, mat'l $3"   I haven't a clue 
about what the 455 filter is or how it could cause the ATU to fail.  The 
transmitter functioned well with the broken tuner bypassed and using my 
external tuner.  What's also bothersome is the list of functions checked by 
the technician don't include anything associated with the ATU.

I've sent a note to Ten-Tec service asking for an explanation, while waiting 
for a response, does anyone on this list have any thoughts about how the 
noted defect would prevent the internal ATU to work, but permit the radio to 
function normally when not using the internal ATU?

73, Curt KB5JO