Ha ha, well I first developed diphtheria aged 2yrs ...... this slowly transmorgified into rickets ...... then the rot really kicked in.
But .... we haven't got time for all that just now.
Let's keep it basic, if you can hear the router kicking in when on the corded landline phone .....
and you are in the test socket and have tried a new micro-filter ..... then you have a 'HR' fault. End of.
Unfortunately, it could be anywhere between the NTE5 back-plate and the Exchange equipment.
After rickets came 'Black Death', which I battled for .............