As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PARKING BRAKE CAUTION CONSISTENTLY WENT OFF IN CRUISE. MTX ADVISED TO DIVERT BACK TO PDX. RETURNED TO FIELD. REMOVED FROM SERVICE. PERFORMED WIRING CHECKS BETWEEN PARK BRK LEVER 3241-P12 PIN 2 TO CAWP 3312-P5 PIN 16. PIN TO PIN. PIN TO GND. NO DEFECTS NOTED. REPLACED CAWP IAW AMM TASKS 31-51-01-000-801 AND 31-51-01-400-801 FOR PRECAUTIONARY MEASURE. REF. FIM TASK 32-40-00-810-803. OPS TESTS GOOD. AIRCRAFT RETURNED TO SERVICE.