As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK 1 FAIL CAUTION ILLUMINATED ON THE GROUND. QRH PROCEDURE FOLLOWED AND CAUTION RETURNED. HEARD GRINDING NOISE ON L SIDE OF ACFT AND BURNING SMELL. "TRANSFERRED TO NRWC 030-DFW-02683"-C/A-REMOVED AND REPLACED LH ACM IAW E175 AMM 21-51-05. PERFORMED OPERATIONAL CHECK OF LH COOLING PACK IAW E175 AMM 21-51-00, OPERATIONAL CHECK GOOD. SEE NRWC 030-DFW-02683 FOR ADDITIONAL MAINTENANCE.