How do I mend my trouser press?

The heating element seems to have worn out on my Union Pressboy Pressomatic Valet trouser press. Type number:113 798 E-SK Union 12K1. It was bought in Belgium in 1983 and is operated by a switch with a heat sensor which seems to still be working. I would like to repair it because unlike modern machines the Union Pressboy is made of wood. Does anyone know how I could replace the element which measures approx 30cm X80cm?