As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN LANDING GEAR WOULD NOT RETRACT, BOTH RED A AND B LIGHTS STAYED ON. INSPECTED LEFT FOWARD GEAR DOOR AND FOUND OUTBOARD DOOR FOWARD BEARING LOOSE, ALLOWING DOOR TO BE LOOSE AT DOOR SEQUENCE VALVE. REMOVED AND REPLACED LOOSE BEARING AS NEEDED AND ADJUSTED SEQUENCE VALVE TARGET IAW MM 528100. GEAR SWUNG AS NEEDED, OPS CHECK GOOD.