As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE WAS FILLING COCKPIT & CABIN DURING APU START, BLICING SMELL FOLLOWED AFTER SELECTING PACK ON. TROUBLE SHOT & FOUND SMOKE TO BE CAUSED BY LT PACK. INSTALLED DRAIN HOSE IAW CRJ 700 AMM 21-51-08. NO FURTHER DEFECTS NOTED. MEL RESTORED.