What was found
AFTER TAKEOFF, FOLLOWING POSITIVE RATE GEAR UP CALL, DOORS GEAR REMAINED ON PAST NORMAL CLEANUP. EICAS MESSAGE FOLLOWED UP WITH GEAR DISAGREE AND GEAR DOORS, FLT CREW FOLLOWED QRH, LEVELED AT 5000 MSL. AIRCRAFT ACCELERATED TO 250 K. AS FELT PHYSICAL MECHANICAL THUMP AS GEAR RETRACTED AND ALL LIGHTS AND CAUTIONS EXTINGISHED. REPLACED THE LT MAIN GEAR UPLOCK SEQUENCE VALVE IAW MM 32-32-09-4. PERFORMED MAIN GEAR EXTENSION AND RETRACTION IAW MM 32-32-00-5, SYSTEM OPERATED NORMAL.