B737 Captain rejects takeoff for door warning light at 80 KTS. After reclosing the door and waiting for brake cooling flight departs uneventfully.

Narrative

Aborted a takeoff at 80 KTS for a 'Forward Entry' door light. Properly applied the memory items. Went into the Rejected Takeoff checklist and followed each step. Went into the performance computer and determined brake cooling was required and properly adhered to the brake cooling time. I see this door light sometimes prior to pushing off the gate. The fix is to ask the Flight Attendants to check the door handle. I did the same for this event. This caused the light to go out. Since it was something I was familiar with; I was comfortable; after following the checklist and cooling times; to continue the flight. After giving this more thought; I decided that since this event did not happen at the gate and it happened going down the runway; I should have had Maintenance come out and inspect the door. I should have involved maintenance and dispatch during the brake cooling time. Supplemental information from ACN 830445: Prior to departing gate; all door lights were extinguished. Captain's takeoff. At approximately 75-80 KTS; we had a Master Caution/Door/Forward Entry Light(s) illuminated. The Captain executed the memory items for a rejected takeoff. The rejected takeoff was uneventful. We taxied off at the first available opportunity; notified Tower and noted no assistance was required. The Forward Entry light extinguished after leaving the runway. The remainder of the Rejected Takeoff checklist was completed and ran brake cooling data at 95 KTS. We called Operations to notify the required agency within the Company of our rejected takeoff. We waited the required brake cooling period per the performance computer prior to departing. Due diligence when securing aircraft doors.