Hello, I need help with the HP8920B communication monitor, when I run the rf test on the receiver module, I have the message "Receiver Assembly (low)" in the 100MHz 614.3MHz IF and 500MHz 114.3MHz IF tests. I've already disconnected all the cables and boards and cleaned everything up, but the glitch remains. this failure decreases when the HP8920B is on for more than 3 hours, but it does not disappear. sorry for my bad english.