As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH ONLY THE RT ENGINE RUNNING YOU GET NO MESSAGE BUT WITH BOTH ENGINES RUNNING YOU GET RT ENG CONTROL MESSAGE. REPLACED NR 2 ENG EEC, NO HELP. MESSAGES (R ENG EEC C2 & R ENG CONTROL) STILL DISPLAYED AND WILL NOT ERASE AFTER ENG RUNS. REPLACED EEC ALTERNATOR. RAN BOTH ENGINES TWICE. OPS CHECKS, NO EEC MESSAGES PRESENT.