As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 2630 - THE CREW REPORTED A LAV SMOKE WARNING MESSAGE ON THE EICAS AFTER SELECTING COOLING PACKS DURING TAXI. THE ACFT RETURNED TO THE GATE WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE APU. OPERATIONAL CHECKS WERE GOOD. (S)