As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENG HYD LOW PRESS LIGHT AFTER PUSHBACK AND FLAPS SET TO 5 DEGREES. HYD B QTY DROPPED TO 78%. GROUNDED - YES. FOUND PRESSURE LINE FROM ENGINE-DRIVEN PUMP DAMAGED AT PYLON, REMOVED AND REPLACED PRESSURE LINE. PERFORMED GROUND VERIFICATION AND LEAK CHECK, GOOD REF B737-800 AMM 29-11-11-400-801-001 & 71-00-00-700-821-F00, BLED AND RESERVICED B SYSTEM RESERVOIR, REF AMM 12-12-00.