keypad Service code for Panasonic DECT phone

[Andy]

hi all, I wonder if anyone knows what the service code might be for putting
a Panasonic KX-TCD DECT telephone into service mode? - I remember doing it
years ago on a Panasonic DECT phone and using soft switches to change
settings on the phone not found in the normal menu and diagnose parts of the
phone such as test LED lights and keypad.

I have been in touch with Panasonic Technical support but obviously they
wont give the info out.

thanks in advance if you have any info.

Andy.