I think I need to comment as well.

You stated:

"Some lines show 48 to 51 volts Tip to ring where others are around 37 to 38 volts".

SO, which lines are failing?

That is, are the 37 to 38 ones the bad boys, or is the failure with the other ones?

My guess is the lower voltage ones are your bad boys.

Do you see a pattern, based on this question?

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