What was found
DURING A HEAVY MAINTENANCE EXCEPTANCE FLIGHT, THE AIRCRAFT LOST A-SYSTEM HYDRAULICS, ALL QUANTITY LOST, ABNORMAL PROCEDURE COMPLETED, HYD FLUID SHUTOFF VALVE CLOSED FOR 1.5 MINUTES APPROX. REMOVED AND REPLACED ELEVATOR FEEL COMPUTER IAW B727 MM 27-30-101, LEAK CHECK GOOD IAW B727 MM 27-30-0, OP'S CHECK GOOD IAW B727 MM 27-30-101.