That reads as though you have E-side and D-side mixed up, or at least as I was referring to them, which was in terms of your existing line.
Both MHC and myself are suggesting the fault could possibly be a connection within the PCP, and that all your connections in there could change, so curing it as a side-effect.
But if the fault is on the D-side, ie between you and the PCP rather than inside it, then your FTTC will be probably be affected.
If the fault is on E-side now, between the PCP and the exchange, there is a high probability that although it will still be there it will not affect the FTTC. In time it would probably get worse and in time the phone will fail and they will fix it, but I would expect the FTTC, (I don't know), would carry on regardless even then.
We have a PSTN E-side problem which used to really hurt the ADSL, but on FTTC things are fine.
(Edit - got interrupted by a phone call, so didn't see your correction, but leaving this post here

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Edited by RobertoS (Mon 02-Jan-12 15:02:31)