What was found
AFTER TAKEOFF, PILOT NOTICED BOTH LT & RT HYD FAIL ANNUNCIATORS ILLUMINATED, VERIFIED FAILURE HYD PRESS INDICATOR WAS READING ZERO PRESSURE. PILOT INFORMED ATC OF THE SITUATION & PERFORMED A MANUAL EXTENSION OF THE LG. PILOT RECEIVED THREE GREEN DOWN & LOCK INDICATION LIGHTS. PERFORMED A ZERO DEGREES FLAP LANDING WITHOUT INCIDENT. TROUBLESHOOTING REVEALED A CRACKED END CAP ON THE HYD ACCUMULATOR. REPLACED ACCUMULATOR WITH OVERHAULED UNIT. REPLACED BOTH ENG DRIVEN HYD PUMPS. PERFORMED OPERATIONAL CHECKS OF HYD SYS. ALL CHECKS WERE NORMAL.