As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW FOUND DURING THE PREFLIGHT INSPECTION THAT THE CABIN BLOWER WAS INOPERATIVE. THE FAILED BLOWER HAD A TOTAL OF 22.7 HRS FROM INSTALLATION. THE FAILED AFT BLOWER WAS REMOVED PN 1133210-7, SN 1506. INSTALLED A NEW MOTOR SN 1508, OPERATIONS CHECKED OK.