As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AFT LAV WARN MSG INDICATED INTERMITTENTLY. DETECTOR TEST OK. NO VISIBLE OR SMELL OF SMOKE NOTED. REMOVED AND REPLACED AFT LAV SMOKE DETECTOR IAW CRJ900 AMM 26-16-01-000/400-801-A03.PERFORMED OPS TEST IAW CRJ900 AMM 26-16-00-710-801-A01 AND TEST GOOD AT THIS TIME.THIS CLEARS MEL