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this is the existing unit, which i believe this document pertains to (useful!)
this is a close up of the bundle of wires which seem irrelevant:
and a closer look at the b/r/w wire endings which were severed:
from the corresponding wires on the outer part of the handset which comes away:
from the instructions of the booklet i found (link above) it looks like i just need to reconnect the b/r/w wires?
what's wrong with the existing unit, and are there any model/part numbers?
how many white cables go into the unit?
A piccy of the places where the existing wires are terminated would also help