As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON A/C WITH BUS-TIE OPEN, LEFT MAIN BUS (PS1) AND RIGHT MAIN BUS (PS2) SHOULD BE SEPARATED. COULD NOT SEPARATE PS1 AND PS2. THEY WERE INADVERTENTLY LINKED TOGETHER THROUGH A PLUSELIGHT INSTALLATION. HAD A PULSELIGHT SYSTEM INSTALLED, A COMPONENT OF THE PULSELIGHT SYSTEM WAS INCORRECTLY INSTALLED. IT IS THE CURRENT LIMITER.