Hard to say, but it could be the result of a spike or surge. Problem is even the newest MC21 is 25 years old now, and problems can creep in anywhere. Corrosion within the harness somewhere, or chaffing caused by missing harness restraints or general wear and tear could've created a short.

Fingers crossed it's just a coincidence... maybe they were just 25 year old bulbs?!

As a side note however, the reg/rec is a known [relatively] weak point on the MC21.
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Andy.
NSR-WORLD.COM

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