As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AFT LAV. REMOVED AND REPLACED SMOKE DETECTOR IAW CRJ 900 AMM 26-16-01-000/400-801-A01-PSA OPS CHECK GOOD. PERFORMED OPS TEST OF THE AIR CONDITIONING DISTRIBUTION SYSTEM IAW CRJ 900 AMM 21-51-00-710-801. OPS CHECK GOOD. NO SMOKE OR ODORS DETECTED.