As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIREP - LANDING GEAR FAILED TO EXTEND USING NORMAL SYSTEM. MANUAL EXTENSION PERFORMED. MAINTENANCE REPLACED WATER LOGGED HYDRAULIC POWER PACK RELAY (SUSPECT THAT RELAY WAS FROZEN AFTER FLIGHT AT ALTITUDE). SEALED WING LEADING EDGE GAP TO HELP REDUCE FREE WATER / MOISTURE IN ELECTRICAL BAY.