What was found
BRAKES AUTO BRK FAULT AND BRAKE RELEASED ECAM MESSAGES DISPLAYED AFTER TAKE OFF. BRAKE TEMPS AT GATE ARRIVAL NR 1, 465, NR 2, 40, NR 3, 270, AND NR 4, 240 DEGREES. REPLACED THE NR 2 TACHOMETER IAW 32-42-57. OPS CHECKED GOOD. OKAY FOR SERVICE. AIRCRAFT WAS GROUNDED.