What was found
AIRPLANE WAS HARD TO STOP WITH MODERATE TO HEAVY BRAKING. VERY HARD TO SET PARKING BRAKE AS WELL. NO AUTOBRAKE WAS USED AND FULL REVERSE THRUST. GROUNDED - YES. R&R PARKING BRAKE SHUT OFF VALVE REF AMM 32-44-21. ACCOMPLISHED AMM TASK UP TO F(11) UNABLE TO CONTINUE DUE TO CONNECTOR M01 FUNCTION 1067655. CONTINUE ON AMM 32-44-21 UP TO STEP G3. PARKING LIGHT REMAINS OFF AND UNABLE TO CONTINUE SUSPECT VALVE BAD FROM STOCK. REMOVED BAD FROM STOCK PARK BRAKE VALVE IAW AMM 32-41-21. OPS CKS GOOD PER SAME REF. ACCOMPLISHED TAXI AS REQUESTED, BRAKES FEEL NORMAL,OPS TEST GOOD AT THIS TIME.