As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FADEC CAUTION IN FLIGHT / INTERROGATED MDC DURING ENGINE RUN FOUND MULTIPLE CURRENT FAULTS B1 CODES 006573, 153527, 153474. ALL FIMS LISTED LH FADEC AS PROBABLE SUSPECT. REMOVED AND REPLACED LH FADEC IAW CRJ900 AMM 73-21-01-000/400-801. OPS CHECK GOOD, BITE TEST GOOD, FAULTS NO LONGER PRESENT.