What was found
AIR TURNBACK / DECLARED EMERGENCY. OUT OF FLT 240 ALL 3 COCKPIT CREW SMELLED FUMES, 02 MASKS ON. RECHECKED, NO SMELL. F/A CALLED FROM BACK, PAX SMELLED SMOKE. RETURNED TO TPA UNEVENTFUL. FOUND HYD A-SYSTEM OVERSERVICED. SERVICED RESERVOIR TO PROPER LEVEL PER MM.