As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4640. DURING CLIMBOUT, NOSE GEAR WOULD NOT RETRACT. AIRCRAFT BELOW 200 KTS. CYCLED GEAR AND RAN CHECKLIST. DECLARED AN EMERGENCY, RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. ACCOMPLISHED FIM TASK 32-31-00-810-804 PAG 229-236, AND ACCOMPLISHED LANDING GEAR EXTENSION AND RETRACTION TEST IAW AMM 32-30-00-710-810. COULD NOT DUPLICATE FAULT, OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.