amstrad drx550 repair?

the jack that accepts the satalite cable plug ---appears to be loose and broken inside the casing. there is a locking nut---which had come loose and the cable looks like its been 'pulled'.
the symptom is very distoted sound (picture ok).
however, when you waggle the plug &jack---the picture &sound intermittently go on &off.
is it easy to repair / get spare part ?.

jimbo
February 2010