As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON 1ST START OF THE DAY, NR 1 ENG WOULD NOT ACCELERATE PAST 40 PERCENT NI. PROBLEM WAS TROUBLESHOT & ALL INDICATION POINTED TO THE AFCU. A NEW UNIT WAS THEN INSTALLED & THE ACFT WAS SUCCESSFULLY STARTED. THAT PROVED THE ORIGINAL AFCU WAS THE FAULTY COMPONENT. THE AFCU WAS 18.8 HRS OUT OF O/H.