What was found
ABORTED TAKEOFF AT 80 KTS DUE TO A MASTER WARNING INDICATION. BRIEFLY SHOWED EXACT WARNING LIGHT. LANDING UNEVENTFUL. REMOVED FROM SERVICE. RAN ENGINES WITH BLEEDS ON AND PRESSURIZATION IN AUTO TWICE FOR ONE MINUTE EACH. CND. PERFORMED MQAR DOWNLOAD IAW MCN 64602-14 ISS 6. PERFORMED OPS TEST OF APU AND NACELLE FIRE DETECT SYSTEM IAW AMM 26-11-00-710-801, AND 26-13-00-710-801. TEST PASSED. PERFORMED AN OPS TEST OF CARGO SMOKE DETECTORS IAW AMM 26-12-06-710-801. OPS TEST PASSED. SELF TEST OF ALL FIRE AND SMOKE PROTECTION PASSED. SMOKE OR CHECK FIRE DETECTOR WARNINGS DID NOT ILLUMINATE AT ANY TIME. COMPLIED WITH FIM 21-30-000-810-801, STEPS 3A(3)-3A(4). NO RELATED FAULTS FOUND, FUNCTIONAL CHECK OF PRESSURE CONTROL PANEL GOOD. PERFORMED FUNCTIONAL TEST OF TAIL STRIKE WARNING SYS IAW AMM 31-53-00-720-801. FUNCTIONAL TESTED GOOD. AIRCRAFT RETURNED TO SERVICE.