As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LT ENG ANTI-ICE ANNUNCIATOR WOULD NOT ILLUMINATE WHEN THE SYS WAS ACTIVATED. EXTENSIVE TROUBLESHOOTING FOUND THE LT ENG WIRING HARNESS PN 3052134-01 SN AA87179 DEFECTIVE. A NEW WIRING HARNESS OF THE SAME PART NUMBER WAS INSTALLED. FUNCTIONAL CHECKS WERE SATISFACTORY. THE ACFT WAS RETURNED TO SERVICE.