There is no real reason you should open up the master and disconnect the ring wire. T3. Just be very careful and makes sure you do not disturb T2 and T5. Only 2 and 5 do anything.
If other terminals are also connected it does no harm to disconnect those as well. In theory there is no way they can have any effect. In practice we have seen a few cases where they do.
In your setup it might pay to disconnect the ring wire at all extensions as well. Again, theoretically that should make no difference, but has been known to.
Is everything that uses the phone line connected through a filter? Nothing should connect direct to the line. Phone-connected burglar alarms also need an internal filter, so if you have an old one that may also be a problem.
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