As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VARN NR CAUTION DOES NOT ILLUMINATE ON THE CAD AS REQUIRED FOR FLIGHT. A T/F EVALUATION REVEALED VAR NR LIGHT ON CAD WENT OFF WHEN AVIONICS MASTER SWITCHES WERE TURNED ON. VAR NR LIGHT IS SUPPOSED TO REMAIN ILLUMINATED. REMOVED AND REPLACED VARTOMS MONITOR BOX ASSEMBLY; T/F COMPLETED IAW AMM 05-60-00, 6-1.