What was found
AIRCRAFT REJECTED TAKE OFF AT 50 KNOTS, DUE TO DURING TAKEOFF ROLL THE LT BLEED TRIP OFF LIGHT TURNED ON, SO THE FLIGHT CREW ACCOMPLISHED THE QRH 2.6 PROCEDURE, CONFIRMING THE FAILURE. REPLACED THE LT ENG PRSOV IAW AMM 36-11-04, CONTINUING THE FAILURE, SO THE REPORT WAS DEFERRED IAW MEL 36-5-2 CAT C. AT MEX, THE LT ENG PROV WAS REPLACED IAW AMM 36-44-04, TESTED CORRECT & THE REPORT WAS CLOSED.