As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. RETURNED TO FIELD. FAULTS WITH PROXIMITY SENSORS 21GA & 23GA. STRUT IS SHOWING A 250 PSI DIFFERENCE BETWEEN UPPER & LOWER CHAMBERS, 25 PSI IS GENERAL DIFFERENCE LIMIT. ADJUSTED PROXIMITY SENSOR. PERFORMED FULL STRUT SERVICE & GEAR SWING 32-31-00-720-002.