What was found
KPBI CREW REPORTED THAT JUST AFTER ROTATION THE LEFT AND RIGHT THRUST REVERSER ARM LIGHTS HAD ILLUMINATED. THE EMERGENCY STOW BUTTONS WERE IMMEDIATELY PRESSED. THE AIRCRAFT RETURNED TO KPBI AND LANDED WITHOUT FURTHER INCIDENT. THE ARM LIGHTS HAD REMAINED ILLUMINATED FOR THE DURATION OF THE FLIGHT. MAINTENANCE VERIFIED THE DISCREPANCY AND ADJUSTED THE RIGHT MAIN LANDING GEAR GROUND SAFETY SWITCH. SEVERAL GEAR RETRACTIONS WERE PERFORMED WITH NO NOTED DISCREPANCIES. AIRCRAFT WAS RETURNED TO SERVICE.