What was found
AIRCRAFT WAS GNDED. AFTER TAKEOFF FLIGHT ATTENDANTS REPORTED FUMES IN CABIN, DESCRIBED AS A PUNGENT & ACRID ODOR. ACFT RETURNED, CREW DID NOT DECLARE AN EMER. ATC DID DECLARE & EMER CFR RESPONDED. PERFORMED JC 26L00021001, TROUBLESHOOT CABIN AIR QUALITY, WITH NO SMELLS NOTED. ALL CABIN LIGHTS WORKING PROPERLY. ALL GALLEY & LAVATORY EQUIPMENT WORKING PROPERLY. ACCOMPLISHED RUNS OF ENGS & APU WITH ALL PACK CONFIGURATIONS WITH NO SMELLS NOTED. ACFT OK FOR SERVICE.