Thanks to everyone for the fast and informative replies! Currently busy with the portables for a fleet wide codeplug update and will look into the CS7000 again at some point. For the CS7000, it was just some quick troubleshooting using a Harris spec serial cable but will be trying a standard serial cable. Which appears to be missing from the shop... However, was able to read a couple of serviceable radios on the rack but had issues with the ones sitting loose under a table. Did not know it could be set to pgm menu from the faceplate though, gotta rtfm a bit more. Have also emailed the local Harris shop to ask for the firmware since there are no backups here... From the various posts here on the CS7000, it sure sounds like these radios are a bit finicky with power and firmware. Have a quote for the service manuals too, nice and pricey...
Cheers, Ed