What was found
AIRCRAFT WAS GROUNDED: DURING DESCENT AND APPROACH, FLIGHT ATTENDANT REPORTED A STRONG SMELL OF EGGS AND FRESH OIL REPORTED IN THE MID CABIN . MAINTENANCE FOUND THE WASTE / TOILET SERVICE SUPPLY LINE CAP LEAKING FLUID. THE FLUID WAS RUNNING DOWN THE BELLY OF THE AIRCRAFT AND INTO THE APU INLET. MAINTENANCE REPLACED THE CAP AND ACCOMPLISHED A SATISFACTORY LEAK CHECK PER AMM 38-31-71. NO ODORS WERE NOTED