What was found
LOSS OF BRAKING WITH THE PARKING BRAKE SET ENGINES RUNNING AT GATE. PLANE MOVED FORWARD 2-3 FEET. MEMORY ITEMS APPLIED AND PLANE CAME TO A STOP PARKING BRAKE HANDLE CYCLED AND BRAKE PRESSURE RESTORED. AIRCRAFT WAS REMOVED FROM SERVICE AS A RESULT OF THIS EVENT. FOLLOWED TSM 32-45-0-810-806-A, FOUND PARKING BRAKE CONTROL VALVE (102GG) NOT FUNCTIONING CORRECTLY WHILE PERFORMING OPS TEST. PARKING BRAKE SWITCH OK WIRIING OK. REMOVED AND REPLACED CONTROL VALVE 102GG IAW AMM 32-45-53-800-400-001-A. OPS TEST GOOD BSCU TEST GOOD. A/C OK FOR SERVICE. T/W SNJC1738 DD: 03-29-25