As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON VECTORS FOR APPROACH, NR 1 SOURCE OFF LIGHT ILLUMINATED. FOLLOWED QRH AND PUT APU ONLINE. ACFT GROUNDED. PERFORMED THE INSTRUMENT LANDING OPERATIONAL TEST IAW AMM 34-31-00-710-801 AND THE AIR DATA REFERENCE SYSTEM SELECT OPERATIONAL TEST IAW AMM 34-21-00-710-802. COULD NOT DUPLICATE DEFECT. SOURCE OFF INDICATOR IS NOT ON.