how can i fix my vax rapide delux v-026?

My vax broke last month,yesterday i decided to check the wiring before dumping it.the wiring to the on-off switch and brush on-off switch looked damaged.On futher inspection there is a small polythene bag covering what looked like a fuse,it had blown out of recognition.is there any way of repairing it myself or if not how much will it cost me to have it repaired.Thank You.sue