What was found
WHILE OBSERVING THE MAIN CABIN DOOR, LOCKED FROM THE OUTSIDE, THE VENT DOOR PROTRUDES OUTWARD AND DOES NOT SEAT WITH THE AIRFRAME. AT LEAST A 1/4" GAP EXISTS. CREW DID NOT ENTER. WHILE OBSERVING THE MAIN CABIN DOOR, LOCKED FROM THE OUTSIDE, THE VENT DOOR PROTRUDES OUTWARD AND DOES NOT SEAT WITH THE AIRFRAME. AT LEAST A 1/4" GAP EXISTS. CREW DID NOT ENTER. UPON ARRIVAL TO AIRCRAFT FOUND CABIN DOOR RESTING ON THE PRECATCH (WAS ABLE TO OPEN DOOR BY PUSHING PRECATCH RELEASE BUTTON PRIOR TO UNLOCKING DOOR). OPERATED DOOR SEVERAL TIMES WITH NO DEFECTS NOTED IAW MM 52-10-00.