Unless you ring and ask your CP if any work has been carried out on your circuit recently, we can never know .... only speculate ??
For example ..... the remote line test all CP's perform before raising an engineering task may have identified an issue at the Exchange, or at the Cabinet .... etc etc ..... which would mean the fault
could be cleared without need for access to the premises ??
Similarly if the issue
had been a contact fault, as described above, then the other party may have reported their own circuit and as a result of that being repaired, yours has to
All pure guess work.