As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN LANDING GEAR DID NOT RETRACT ON TAKEOFF. 2 ATTEMPTS MADE. NOSE CAME UP WITH GREEN LIGHT OUT, BUT MAIN STAYED DOWN WITH GREEN INDICATIONS, RED LIGHT ON IN HANDLE. MAINTENANCE REPLACED MLG CONTROL VALVE PN HTE9990-4, SN ON 391VB146.