As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, CREW FELT A COUPLE OF ABRUPT VIBRATIONS, THEN NOTICED THE ITT WAS ABOUT 910. CREW DECREASED ENGINE POWER AND FELT MORE VIBRATIONS, LEVELED OUT 13000 FT. FA REPORTED VIBRATIONS ON THE LT SIDE OF THE ACFT, RETURNED TO FIELD. EMERGENCY DECLARED. LT ENGINE ITT WAS HIGHER THAN THE RT DURING FINAL. LANDING WAS UNEVENTFUL TAXIIED TO THE GATE. ENGINE WAS NEVER SHUT DOWN. OPEN.