As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: L1 DOOR INDICATION ILLUMINATED ON TAKEOFF WITH MASTER CAUTION. ABORTED TAKEOFF AT 70 KNOTS. SAFELY RETURNED TO GATE. ADJUSTED GAP ON L1 DOOR INDICATION SWITCH S1147 PER AMM 52-71-11. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.