As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED. DURING TAKEOFF BOTH MASTER CAUTION LIGHTS ILLUMINATED WITH NO OTHER INDICATIONS. TAKEOFF ABORTED AT APPROX 60 KNOTS. FLIGHT CREW DECIDED TO ATTEMPT TAKEOFF AGAIN DUE TO LACK OF ANY SPECIFIC WARNING. BOTH MASTER LIGHTS AGAIN ILLUMINATED & WERE NOW ACCOMPANIED BY OVERHEAD & AIR CONDITION WARNING LIGHTS. TAKEOFF ABORTED AT APPROX 60 KNOTS. R & R THE LT ENG TAI VLV IAW AMM 30-21-11. OPERATIONAL & LEAK CHECKED GOOD.