As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
N2 VIB AT ROTATION. CONTINUED. DID QRH AT SAFE ALTITUDE. N2. VIB WOULD GO OUT AT 81-82 PERCENT AND BACK ON AT 83-84 PERCENT HIGHER. ENGINE SOUNDED DIFFERENT AS WELL. RETURNED TO RAP. REMOVED AND REPLACED RIGHT ENGINE SUM TRANSDUCER IAW CRJ MM 77-31-01. PN 6233M30A SN ON BP28 SN OFF 088 BE78. OPS CHECK GOOD.