As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYC - OTHER AIRLINE REPORTED SPARKS FROM LEFT ENGINE ON TAKEOFF ROTATION AND ON INITIAL CLIMBOUT. CREW REPORTED NO ABNORMAL INDICATIONS. EMERGENCY DECLARED FLIGHT RETURNED YYC LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT ENGINE AT YYC ON 11/20/2011. SYSTEM GROUND CHECK NORMAL OPERATION.