As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2280 AUTO FEATHER ENGINE NR 1 REST ECU AS DIRECTED BY MTX UPON SECOND TEST AS TEST SWITCHES 1 AND 2 BROUGHT UP, POWER UPTRIM LIGHT CAME ON AND BOTH ENGINES FEATHERED. MAINTENANCE REPLACED NR 1 TSCU. COMPLIED WITH POST RUN PER MTC 9720019. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.