As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR FAILED TO EXTEND WITH GEAR HANDLE SELECTION. LANDING GEAR EXTENDED USING HAND PUMP SYSTEM, GEAR INDICATIONS WERE NORMAL. FOUND LANDING GEAR PUMP RELAY CONTAMINATED WITH WATER AND SUSPECT UNIT FROZE IN-FLIGHT AND FAILED TO POWER ELECTRIC PUMP. SEALED NEW RELAY PLUNGER BODY WITH SILICONE RTV TO PREVENT MOISTURE CONTAMINATION AND INSTALLED IN AIRCRAFT. RETRACT TEST C/W, OK.