From what I gather after having a read around, some say that disabling the region can only be done with a phsyical hardware chip add-on, where as others give various remote sequences to try. This page on VideoHelp.com lists different user's tips.
The most common remote sequence I come across is the following (with no disc loaded): Press the buttons: Stop, Stop, Setup, 3, 8, 8, 8, 3, 0. To set it to a specific region code, replace the final 0 with the region number. As I don't actually have a Panasonic DVD recorder handy (let alone this model), I cannot confirm if this or any of the other remote sequences work. :rolleyes: