As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GSO - THE FORWARD DROP CEILING EMERGENCY POWER SUPPLY SELF TEST ILLUMINATES ALL FLOOR TRACK LIGHTING INSTEAD OF 75 PERCENT OF TRACK LIGHTING. FOUND DEFECTIVE DIODE AT OVERWING EXIT ROW. REPLACED DIODE IAW WDM 33-15-03. CHECKED SYSTEM OPERATION PER DC-9 MM 33-53-0. SYSTEM OPS CHECK GOOD. (M)