As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AND GEAR HANDLE SELECTED TO THE UP POSITION THE UNLOCK LIGHT REMAINED ON, TRIED TO RECYCLE GEAR HANDLE BUT PROBLEM REMAINED THE SAME. REMOVED AND REPLACED L/G PC BOARD AND NOSE GEAR UP-LOCK SWITCH. PERFORMED UP-LOCK CHECK, SEQUENCE ACTUATOR RIGGING ADJUSTMENT AND NOSE LANDING GEAR ACTUATOR TEST. ALL WORK DONE IAW CESSNA CITATION MODEL 560XL MM CHAPTER 32-30-03 & 32-30-05.