What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
In cruise at flight level 290, 90 miles s sw mci copilot smelled electrical odor in cabin. Located source at lavatory, pilot pulled circuit breaker for lavatory and odor subsided. Made precautionary landing at mci, maintenance personnel arrived from st. louis and found heat blanket from water tank to sink discolored. Thought this to be the source of odor, aircraft returned to maintenance base for further investigation. Heat blanket found to be operating normally, no definitive cause for odor found. Director of maintenance believes the bleed air plumbing may have become extremely hot due to auto temp control being on. Auto temp attempting to raise cabin temperature rapidly could cause extreme heat at bleed air plumbing and create hot or electrical smell in cabin. This incident #CE99IGA0020 is considered closed.
As the FAA filed it
IN CRUISE AT FLIGHT LEVEL 290, 90 MILES S SW MCI COPILOT SMELLED ELECTRICAL ODOR IN CABIN. LOCATED SOURCE AT LAVATORY, PILOT PULLED CIRCUIT BREAKER FOR LAVATORY AND ODOR SUBSIDED. MADE PRECAUTIONARY LANDING AT MCI, MAINTENANCE PERSONNEL ARRIVED FROM ST. LOUIS AND FOUND HEAT BLANKET FROM WATER TANK TO SINK DISCOLORED. THOUGHT THIS TO BE THE SOURCE OF ODOR, AIRCRAFT RETURNED TO MAINTENANCE BASE FOR FURTHER INVESTIGATION. HEAT BLANKET FOUND TO BE OPERATING NORMALLY, NO DEFINITIVE CAUSE FOR ODOR FOUND. DIRECTOR OF MAINTENANCE BELIEVES THE BLEED AIR PLUMBING MAY HAVE BECOME EXTREMELY HOT DUE TO AUTO TEMP CONTROL BEING ON. AUTO TEMP ATTEMPTING TO RAISE CABIN TEMPERATURE RAPIDLY COULD CAUSE EXTREME HEAT AT BLEED AIR PLUMBING AND CREATE HOT OR ELECTRICAL SMELL IN CABIN. THIS INCIDENT #CE99IGA0020 IS CONSIDERED CLOSED.