The nac and nap probably need servicing. The cd player - not sure if still possible at Naim HQ.
If you are in the UK then official servicing is easy.
Do you know how to connect them up?
The 4 pin one end and 5 pin other end cable could only go one way if that’s what you mean. Used input 2 on the back of the pre amp which corresponds with CD selector on the front. Correct?
Therein lies a problem. Original speaker cables which are of a given length from where I previously lived are now under laminate flooring and the only place for a decent “listening room” means I can’t move them.
If you’re in the UK you have a choice of the Naim factory (via your Naim dealer) or Class A who are Naim approved, and can work out less expensive than having them serviced by the factory.
It comes from my motor vehicle background and when the web started catching on I had to decide on a “handle” and I then had an Alfa V6 which has four camshafts, as does my current/last ever car
Welcome and enjoy your new acquisitions - i’m sure you’ll be pleased with the musicality. Keep them powered up and the SQ should improve after a few days