As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ROC- FLIGHT 3943 AT 700 FT 8 MINUTES OUT WHILE ON DESCENT TOWARD ROC FROM LGA, SMOKE SMELL IN CABIN AND COCKPIT WHEN NR 1 BLEED SWITCH IS ON. NO VISIBLE SMOKE OBSERVED. EMERGENCY DECLARED, AIRCRAFT LANDED IN ROC WITHOUT INCIDENT. MAINTENANCE VERIFIED SMOKE COMING FROM LEFT ENGINE. LEFT ENGINE REPLACED IN ACCORDANCE WITH COMPANY JOB CARD 008-7101-349, LEAK AND OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.