If it was hot enough to melt that, make sure you're checking the rack temps with a temp gun before anything else. That shouldn't be able to happen.
I actually picked up an AP rack second hand where the tape burned a hole through the tub on the bottom. I don't know if it was a similar issue or not... just how I got it. The old heat tape was still in it and it had one single nasty burn spot. The rest of the tape seemed fine, but I didn't risk keeping it.
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