As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
KLAS - AFTER LEAVING KLAS AT APPRO FL450, THE RED DOOR WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO KLAS, PASSING THOUGHT 8000 FEET ON DESCENT. THE LIGHT EXTINGUISHED. AIRCRAFT INSPECTED AND DEFERRED PER MEL 52-1 FOR RETURN TO DTW. ADJUSTED AFT UPPER SWITCH PER GULFSTREAM MM. (M)