PGPV5

2005 Mk 2 Galaxy diesel. The blades slowed down and eventually stopped. The linkage looks OK but the motor securing bolt was found to be loose. I tightened this up and it worked OK for about 3 minutes. Where can I get an inexpensive motor from and how do I fit it? I took the complete unit out but the power connector was very difficult to disconnect. Can the motor be changed or is it the whole motor assembly to the linkage?