What was found
RT MAIN GEAR PRIMARY AND SECONDARY LIGHT ILLUMINATED AFTER GEAR RETRACTION WITH GEAR HANDLE UP. TROUBLESHOT IAW FIM 31-71-00-101, FIG 102. PSEU LAST FLIGHT SHOWS CODES 20, 12, 21, & 13 PSEU SYS TEST SHOWS NO FAULTS WHILE CYCLING MLG DOORS ON GROUND FOUND RT DOOR CLOSE TIME VERY SLOW. REPLACED THE RT MLG DOOR CYLINDER IAW MM 32-34-01-400-801 OPS CHECKED NORMAL.