As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2149, AFTER SETTING TAKEOFF POWER NR 2 NP ACCELERATED TO 1235 WITH AUDIBLE DIFFERENCE IN SPEED RELATIVE TO ENGINE NR 1. ABORTED TAKEOFF AROUND 60KTS. MAINTENANCE REPLACED THE NR 2 PCU IAW MTC 9612201. ENGINE RUN TEST GOOD IAW MTC 9720016. AIRCRAFT RETURNED TO SERVICE.