As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORTED THAT THE LEFT MAIN GEAR FAILED TO RETRACT ON DEPARTURE. RED A& B SYSTEM LIGHTS. THEY CYCLED THE GEAR3 TIMES WITH IDENTICAL RESULTS. MAINTENANCE REMOVED AND REPLACED THE LEFT HAND MAIN LANDING GEAR ACTUATOR IAW MM 32-33-10 AND RIGGED IAW MM 32-30-00. OPERATIONAL CHECK WAS GOOD. RII INPECTIONS COMPLIED WITH PER TASKCARD 4.3.7. OPERATIONAL CHECK FLIGHT WAS SATISFACTORY.