As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE STRONG ELECTRICAL BURNING SMELL IN FLIGHT DECK. FACT 26JAN24 01:13 TRI RAN PACK SYSTEMS 1 AND 2 USING APU AND ENGINE BLDS, INSPECTED AND OPERATED FLIGHT DECK EQUIPMENT WITH NO SMELLS NOTED. INSPECTED PACKS 1 AND 2 AND UNDERFLOOR DUCTS FOR OBVIOUS DEFECTS, SUSPECT DETERIORATED INSULATION ON PACK 1 PIPE AS CAUSE FOR SMELL AND REMOVED LOOSE INSULATION. NO OTHER OBVIOUS DEFECTS NOTED OK FOR SERVICE.