option B, first showing and explaining in layman terms what has happened.
first thing out of ther mouths is, it's worked all these years with out a problem!! first thing out of my mouth is just because it works doesn't make it safe or right. Then i would explain, why it needs to be repaired properly. this usally is engouht to get to do the extra work.................IF not, I would tell them im leaving it disconnected and for them to get a 2nd option, that makes their disscusion right ther, that im not just tring to make more money off of them.They feel good, and I sleep better.