As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR FAILED TO FULLY RETRACT AFTER TAKEOFF. FOUND THAT THE WIRE SOLDERED TO THE HYDRAULIC POWER PACK PRESSURE SWITCH HAD CORRODED BENEATH THE HEAT-SHRINK TUBING, NEAR THE SOLDER JOINT. SUSPECTED: THE MFG OF THE PRESSURE SWITCH ASSY USED ACID CORE SOLDER TO ATTACH THE WIRE LEADS TO THE SWITCH. (K)