As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STBY DC FEED RPDU 81 SHOWN ON CB AND GENERATED SEVERAL SYSTEM FAILURES. WO 17217310 -IN ACCORDANCE WITH AMM DMC -B787-A-24-09-09-00A-520A/720A-A P300 M2 SLOT 5 DC4 CIRCUIT CARD WAS REMOVED AND REPLACED, OPERATIONAL TEST SATISFACTORY. NO FAULT PRESENTS.