As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF WHEN GEAR WAS RETRACTED, ALL 3 GREEN LIGHTS EXTINGUISHED THE RED GEAR UNSAFE STAYED ILLUMINATED THEN THE RIGHT MAIN LIGHT REAPPEARED. RECYCLED GEAR AND ALL LIGHTS EXTINGUISHED. REMOVED PRINTED CIRCUIT BOARD PLB2-4 BOARD FROM ZONE 245 AND INSTALLED NEW PLB IAW CITATION ULTRA MM CH 25-41-02. PERFORMED GEAR FUNCTIONAL CHECK WITH NO DEFECTS NOTED IAW CITATION ULTRA MM CH 32-01-00.