What was found
STRONG ODOR OF JET FUEL FUMES ( NOT EXHAUST) ACCOMPANIED THIS EVENT ON APPROACH AT 4500-5000 MSL LOST PRESSURIZATION: DIFFERENTIAL PRESSURE WAS ZERO PSI. NO FAULT INDICATED IN AIR SYSTEMS OR PRESSURIZATION SYSTEMS. SEE PREVIOUS SQUAWK COOLING FAN REF L.H. PACK MEL'D; AFTER LANDING GOT A MOMENTARY AIR COND MASTER CAUTION BUT IT RESOLVED WITHOUT LATCHING A FAULT. GROUNDED - YES. RAN PACKS ON APU AND ENGINES NO ODOR NOTED.ETAMY 58718 07/12/2024, PERFORMED FIM TASK 05-51 TASK 814 THRU B(4)(B)1)B), NO FINDING IN APU DRAIN, REMOVED AND REPLACED RECIRCULATION FAN FILTERS REF 21-25-01 NO FURTHER CABIN ODOR FOUND. PRESSURIZED TO 4PSI DIFFERENTIAL REF AMM 05-51-91. NO DEFECTS FOUND. ACCOMPLISHED DEU OP CHK REF AMM 21-27-05. OP CHK GOOD. FOUND CONTROL CABIN DUCT AT MIX MANIFOLD UNSECURED REF 61007966. NO FURTHER DEFECTS NOTED. RESECURED DIST DUCT ON DEFECT 61007966.