As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN REFERENCE TO AMDS 2040-0191-4L: DURING THE INSTALLATION, LOW PRESSURE ON EMERGENCY POWER RESERVOIR AT 4L DOOR WAS FOUND. EMERGENCY POWER RESERVOIR ASSY WAS REPLACED BY SERVICEABLE EMERGENCY POWER RESERVOIR ASSY PER B757-200 AMM:52-11-30 AND AMDS 2040-0191-4L STEP 19. (1533744) AIRCRAFT WAS GROUNDED