Sounds to me like you fixed it.
You have a different model DSL Verizon box than I do... that's probably why mine blinks and yours doesn't.
Any time I see a frayed wire on any phone line or electrical equipment I replace it. I don't want to take any chances.
Let us know if the technician finds anything.

Abbie
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My avatar pic is my beautiful
niece Ashley!
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Rest in Peace
3/8/90 ~~ 4/2/12