As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT EXPERIENCED SWITCH OVER TO SYSTEM 2 HYDRAULICS DURING FLIGHT. AIRCRAFT LANDED. RESET TO SYSTEM 1. SYSTEM SWITCHED TO NR 2. TROUBLESHOT AND FOUND SWITCH IN 10DB4 GUIDE ASSY SHORTED. GUIDE ASSY HAD LOTS OF MOISTURE UNDER COVER. GUIDE ASSY REPLACED. AIRCRAFT HAD BEEN OPERATING IN HIGH HUMIDITY, RAIN, AND SNOW.