As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - AFTER TAKEOFF ON FLIGHT 2519, RETURNED TO THE FIELD WITH NR 1 ENGINE VIBRATIONS EXCEEDING 1.7 UNITS. UNABLE TO MAKE CLIMB POWER. ACCOMPLISHED AN UNEVENTFUL LANDING. MAINTENANCE REPLACED THE FAN BLADES FOR THE NR 1 ENGINE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.