As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- ON FLIGHT 2454 'APU PUMP FAIL' AND 'APU ECU FAIL' CAUTION MESSAGES AFTER APU WAS SHUT DOWN AS PART OF AFTER START CHECKLIST. OPERATED APU IAW CRJ AMM 49-10-00. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.