What was found
MFR- DURING ENGINE START NR 3 HYD PRESSURE WAS PEGGED AT 4000 PSI. FA'S CALLED AND STATED A STRONG CHEMICAL ODOR WAS PRESENT. CHECKED SECURITY OF RL4 RELAY. C/W OPS TEST OF STANDBY CONTACTOR BOX PER AMM TASK 24-31-36-710-801 NO DEFECTS NOTED. PERFORMED GVI OF LAV, AFT GALLEY,CABIN, EXTERIOR OF AIRCRAFT NO LEAKS NOTED. CREW PERFORMED ENGINE RUN NO DEFECTS FOUND IN CABIN, LAV, GALLEY AREAS. NO DEFECTS FOUND WITH BLEED AIR ON OR OFF. HYD AT NORMAL LEVELS. RETURNED TO SERVICE. NO PARTS REPLACED.