Jason, it sounds like you've done good work here on two counts...
Originally Posted by JCW
Mariner have also agreed to cover the cost under warranty even though it expired a year ago.
1. The manufacturers or distributors have set a precedent, so if the fault should re-occur, I think they would be obliged to repair again at their expense.
2. Anyone else suffering the same fault ought to be able to use your example to obtain an FOC repair.
Your rights as a consumer are not restricted to a 12month warranty period - goods are supposed to be supplied as fit for purpose, and so high value items like outboard motors are supposed to last many years. Design and/or manufacturing defects are the responsibility of the manufacturer, and remember that although for some strange reason (political lobbying, I suspect) motor vehicles are exempt, marine engines aren't AFAIK.
Top marks to Mariner/Barrus for doing the decent thing.