This points to a problem with the UPAM. I'm confused as to what you replaced with the spare. I would expect replacing the Valcom to not have any effect. Did you check the power supply for the UPAM to see that it is operating?

ETA- Was typing when Tommy posted his advice.

-Hal

Last edited by hbiss; 02/19/18 07:35 PM.

CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.