What was found
(CAN) AN INCIDENT OCCURRED, THE AIRPLANE WAS PARKED AT THE GATE & THE RIGHT ENGINE RUNNING, PROP FEATHERED. THE RIGHT MAIN GEAR RETRACTED CAUSING THE AIRPLANE TO SINK ONTO THE BELLY & RIGHT WING TIP. THE RIGHT PROPELLER CONTACTED THE GROUND & WAS SEVERELY DAMAGED. THERE ARE OTHER AREAS OF DAMAGE TO THE AIRPLANE AS A RESULT OF THE CONTACT WITH THE GROUND & THE GEAR FOLDING. THE AIRPLANE WAS RECOVERED TO THE HANGAR. ATTRIBUTED TO A MAINTENANCE ERROR, TROUBLESHOOTING A LDG DOOR OPEN ISSUE ON RIGHT SIDE, MAINTENANCE WHERE TROUBLESHOOTING USING THE BYPASS DOOR & INHIBIT SWITCH IN THE COCKPIT, THIS CAUSED A HYDRAULIC BUMP IN THE SYSTEM RESULTING IN THE RIGHT GEAR DOWNLOCK UNLOCKING.