I believe proline is Comets own. So with them out of business. Difficult, you may be able to find out who made them for comet, and approach them under warranty, but do not mess, until you have made sure, as messing with it would void warranty.
Usually one of the big manufacturers make all the models going, badged as required, how do you think they get around the price match, never find same model anywhere else, as it is specific to the shop.
SD, January 2013