Did you check all three antenna connections ?
One flylead from the base of the antenna with a ring terminal connected via one of the front trim screws,
One plug in connector from the loom to the radio unit, which is underneath the riders seat stowage box
( remove the box for access to it ), and,
One tucked away underneath the instrument panel fascia somewhere where the lead from the antenna connects to the loom.
If all those connections are all good, then I can only assume the radio unit itself has a fault

Hi Coconut,
Checked only the antenna connects behind the R/H mirror. Currently I'm time poor to check the remainder, especially behind the instrument console. So back to the service manager to fix.
