My OEM windscreen washer pump has given up the ghost. Went to local Toyota dealer - $72 for a new pump. I have the washer container out of the truck with pump attached. It is not clear to me how to pop the old pump off and replace. Parts guy at the dealer's said $72 is for pump only, no reservoir. Any tips on fixing this? Tricks for disconnecting the pump from the reservoir? Thanks - no threads on this so any assistance appreciated.