Hi Amanda, It's very unlikley that you will find a dealer with any of these switches in stock, if you give Gary at arc systems a call he will sort you out with a repair or exchange.
A repair is easiest and cheapest but I have a few new ones if required, 5 pin standard type 'A' din leads you can pick up from Maplins or I'll supply one.
Legsdown, modules after 93 have two connectors, the 'Din' for the old control switch and a 'Molex' for the later press button switch, you ignore the one you don't need