Location: The mountains of Scottsdale, AZ, and the beaches of Maine
Posts: 10,112
I agree with Scott. Something isn't right. All TMs have lights in the vent, and this is the first I have heard of this issue. I wonder if the back shell is closing down tightly enough, or if it is floating too high when latched.
Bill
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2020 2720QS (aka 2720SL)
2014 Ford F-150 4WD 5.0L Bill's Tech Stuff album