As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM AS A CONSEQUENCE OF RIGHT IGNITION SYSTEM FAILED IN LEFT ENGINE. DURING MAINTENANCE REVISION, THE C485 BREAKER LOCATED AT THE P18-2 A1 PANEL WAS THROWN AWAY. THE C485 BREAKER WAS REPOSITIONED IAW MM 74-00-00, TESTED CORRECT.