As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH PACK SPEWED HAIL & RAN AT AN ABNORMALLY HIGH LEVEL. HAIL SPEWED OUT OF FO VENTS ONLY, NOT IN PASSENGER CABIN. GROUNDED - YES. PERFORMED PTC BITE BOTH CONTROLLERS IAW B737-800 FIM 21-62 TASK 801 NO FAULTS. PERFORMED ICE IN CABIN FIM 21-51 TASK 801 THOUGH STEP 4. SPRAY NOZZLE OPERATES NORMALLY. SUSPECT WATER SEPARATOR. L-PACK R&R HIGH PRESSURE WATER SEPARATOR ASSY REF B737-800 AMM 21-51-08-400-802OPS NRML, LEAK CK GOOD.