What was found
FLT 52 MCO-JFK, CREW DECLARED EMERGENCY AND AIR RETURN TO MCO DUE TO STRONG SMELL NOTICED THROUGHOUT CABIN AND COCKPIT. F/A CALLED AND NOTED IT AS WELL. NO SMOKE BUT STRONG ODOR. ACCOMPLISHED FIM TASK 21-20-00-810-801A FOR ABNORMAL SMELL IN CABIN / COCKPIT FOUND EVIDENCE OF COFFEE GRIND INGESTION ON PACK INLET. PERFORMED DUAL HEAT EXCHANGER CLEANING PER AMM 21-51-04. PERFORMED OPS CHECK OF AIRCRAFT PACKS 1 AND 2 PER AMM 21-51-00-710 NO ODORS DETECTED. RAN ENGINES 1 AND 2 PER AMM 71-00-01 NO ABNORMAL SMELLS / ODORS DETECTED.