What was found
ON TAKEOFF ROLL, PRIOR TO V1 TRIPLE CHIME, DOORS AURAL WARNING SOUNDED. TAKEOFF WAS ABORTED. AIRCRAFT RETURNED TO GATE. (FORWARD DOOR LIGHT ILLUMINATED). DEFERRED FORWARD DOOR WARNING SYSTEM IAW MEL 52-70-1C. 4-19-01 PDX FOUND LOWER MICROSWITCH COVER MISSING, REPLACED. CHECKED AND ADJUSTED MICROSWITCH ROLLER SPRING TENSION. VISUALLY CHECKED WIRING AT MICROSWITCH AND FORWARD HINGE ON PAX DOOR. NO DISCREPANCIES NOTED. DOOR WARNING OPERATION CHECKS GOOD.