As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLEED AIR DUCT MASTER WARNING WOULD COME ON INTERMITTENTLY AND REPEATEDLY IN FILGHT 31,000 FEET. COMPLIED WITH QRH MSS EXTINGUISHING 55 PERCENT N1 LEFT ENGINE. STRAIGHTENED WIRE AT 14TH STAGE BLEED AIR DUCT AND TIGHTENED CLAMP AT AIR SWITCH. RAN ENGINE, OPERATIONAL CHECK GOOD. (M)