What was found
FLT 219 - CJS-MTY - DURING TRANSIT CHECK, AT ENGINE STARTING, THE LEFT HYDRAULIC PUMP INDICATED A CERO PRESSURE. BOTH CIRCUIT BREAKERS WERE RESET AND TROUBL REMAINED. HYDRAULIC PUMPS WERE SWAPPED, TESTS OK. IN MTY, THE LEFT HYDRAULIC PUMP WAS REPLACED IAW MM 29-10-05. AT RON MEX 23/24, THE PERFORMANCE TO BOTH PUMPS WERE VERIFIED DURING ENGINE RUNNING, EVERYTHING OK IAW MM 29-10-05. (M)