What was found
AIRCRAFT WAS GROUNDED: APU OFF DESCENDING THROUGH 10000, FLIGHT CREW NOTED A DIRTY SOCK SMELL IN FLIGHT DECK. **SUPPLEMENTAL REPORT FOR AALA202602236304 SUBMITTED 2/23/2026 BY TUL: MAINTENANCE FOUND EVIDENCE OF COKING IN THE APU GEARBOX VENT TUBE AND REPLACED IT PER AMM 49-26-55. MAINTENANCE ALSO REPLACED THE APU GEARBOX AIR-OIL SEPARATOR GARLOCK SEALS PER AMM 49-26-54 (AALA202603064157). A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED PER TASK CARDS 26L00021002. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO LEAKS OR ODORS NOTED.