As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATTEMPTED PUTTING LT GENERATOR ON BUSS AFTER START AND RECEIVED A SOURCE OFF LIGHT SHORTLY AFTERWARDS. ACFT GROUNDED. REPLACED NR 1 IDG REF AMM 24-11-11. OPS AND LEAK CKD OK, REF AMM 24-11-00. COMPLIED WITH UNSCHEDULED REMOVAL FOR CAUSE AND NO CONTAMINATION FOUND REF AMM 24-11-11.