This has happened a number of times with no apparent pattern: I find 2 lines lit up on the phone (M7310) - if you press either line button, it says "Line in Use". The only way I've been able to clear it up is to physically disconnect the incoming CO line (pull the jumper clip off at the punchdown block). Once I disconnect one line, it releases both of them. So far, it has always been Line 1&6 or else Line 2&6. I have asked around and can't find anyone who admits to doing anything unusual to cause it.( ) Any ideas?
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