As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD SQUEAL IN CEILING OVER ROW 18. FOUND SQUEAL EMANATING FROM BALLAST FOR SIDEWALL LIGHTS AT ROW 18AB. DISCONNECT, CAP & STOW CONNECTOR D02940 FROM BALLAST, LOCATED IN CEILING ABOVE SEATS 18AB. SQUEAL STOPPED & SIDEWALL LIGHTS AT 18AB EXTINGUISH. NEED BALLAST, ITEM DEFERRED IAW MEL DUE DEPARTURE STATUS. PARTS 563-0256 05491-28 BALLAST.