What was found
AIRCRAFT DIVERTED TO LAS VEGAS WITH B SYSTEM HYDRAULIC PRESSURE AT ABOUT 3800 PSI. DEBRIEF CREW,CREW REPORTED THEY NOTICE BRAKE PRESSURE WAS AT 3800. THEY LOOKED AT THE HYDRAULIC PAGE NOTICED THE SAME. ONCE AIRCRAFT WAS ON THE GROUND, HAD THEM SHUT OFF ELECTRIC PUMPS. PRESSURE WAS INDICATING 3800. WITH ENGINE OFF PRESSURE WAS SHOWING 3000. FOLLOWING FIM TASK 29-10-809. SYSTEM B HYD PRESSURE ABOVE 3200 PSI PROBLEM - FAULT ISOLATION UP TO & INCLUDING ITEM E, STEP 2, B, 1. REPLACED B HYD SYSTEM PRESSURE TRANSDUCER IAW AMM 29-31-12-000-801 & AMM 29-31-12-400-801. PRESSURIZED B HYD ELECTRIC PUMP. B HYD PRESSURE SHOWS 3020 PSI. NO HYD LEAKS NOTED. COMPLIED WITH NR 2 ENG DRY MOTOR. HYD PRESSURE SHOWS 3140 PSI. LIMIT IS 3200 PSI. WAITING FOR FLT CREW TO IDLE RUN THE ENG. HAD FLT CREW COMPLY WITH AN IDLE ENGINE RUN ON NR 2 ENG. WITH B SYS ELECTRIC PUMP TURNED OFF, EDP WAS SHOWING 3040 PSI. WITHIN AMM LIMITS. OPS CHKD GOOD, LEAK CHKD GOOD.