What was found
FLT 1717 - MCO-SDQ, AIR RETURN TO MCO, FUMES IN CABIN AND COCKPIT. QRH PROCEDURES FOLLOWED. PERFORMED FIM TASK 21-20-00-80-801-A. RAN APU, NR 1 AND NR 2 ENG, BOTH PACKS. NO ABNORMAL SMELL, HAD POWER ON A/C FOR 5 HOURS, NO ABNORMAL SMELL. A/C OK FOR SERVICE.