As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH FLT 7350 CAE-ORD - LAV SMOKE CAUTION MESSAGE. CREW REPORTED THE MESSAGE OCCURRED WHILE TRYING TO COOL DOWN THE PACKS IN MANUAL MODE. CREW REPORTED NO ODOR OR SIGN OF ACTUAL SMOKE. MX OP CHECKS THE LAV SMOKE DETECTION SYSTEM AND PACK SYSTEM WITH NO FAULTS FOUND.