As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAXING & BRIEFLY SETTING THE PARKING BRAKE, THE AMBER BRAKE ANNUNCIATOR & LT BRAKE MINELCO WERE INDICATING. NO OTHER BRAKE ABNORMALITIES WERE OBSERVED. COMPUTER CODES, LT 325 PEDAL SWITCH FAILURE. REMOVED A DEFECTIVE LT BRAKE PCB PN FE422 & SN 4475. INSTALLED A NEW CUSTOMER SUPPLIED PCB PN FE422 & SN 19391. PERFORMED OPS CHECKS OF BRAKE CONTROL SYS WITH NO DEFECTS NOTED AT THIS TIME. ALL WORK DONE IAW MM 32-41-00.