As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF MOVED GEAR HANDLE UP AND NOTICED THE UNLOCK LIGHT REMAINED ON. RECYCLED GEARS TWICE AND PROBLEM REMAINED THE SAME WITH HYDRAULIC PRESS LIGHT STAYING ON. ACCOMPLISHED AIR TURNBACK AND LANDED SAFELY. PLACED AIRCRAFT ON JACKS AND CYCLED LANDING GEAR SEVERAL CYCLES, COULD NOT DUPLICATE DISCREPANCY. INSPECTED UPLOCK SWITCHES RIGGING AND NO FAULT FOUND, OPERATIONAL CHECKS GOOD. REMOVED AIRCRAFT FROM JACKS, ALL WORK PERFORMED IAW CESSNA 560XL CHAPTER 32-30-00 AND 32-61-00.