Um, you're not running fast enough. Faster Forest!! (great catch BTW!)
I've seen residential insulation (think pink, panther, remember?) give rainwater a tint when it gets wet, and George is right, sounds like rust too. There are parts in that light fixture that could rust, not to mention any metal roof trusses from where the water may follow.
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2023 Cougar HT 23MLE
2020 F250 XLT CC 6.2 4WD
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