This my wife's van. Check engine light stayed on today. I took it to the dealership per owner's manual. Mechanic is telling us that oil pump spring is stuck causing oil pressure changes and check engine/ malfunction light to come on. Van has 59,500 miles and regular maintenance with no prior problems. Dealership recommends replacing oil pump spring and will take 5 hours as it is time consuming work. Do you agree with their assessment?

I tried removing fuse 13 on the passenger side, waiting 30 sec, then replacing it. No joy. Checked all fuses having to do with the side doors; all seem OK to my untrained eye. What next?