As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT MAIN GEAR DOOR (AMBER) LIGHT REMAINED ILLUMINATED FOR APPROX 30 SECONDS AFTER SELECTION OF GEAR UP. THE RT RED LAMP AND HANDLE LAMP WERE ALSO ILLUMINATED. FOUND SECONDARY MLG ALT SELECTOR VALVE FILTER CRUSHED. FILTER WAS REPLACED AND ALL OPERATION CHECKS AND TESTS CHECK GOOD. ACFT RETURNED TO SERVICE.