The contact at your dealership is most likely the Sales or 'Customer Service' type of person. They probably know little about what is under your plastics and collect a lot of 'knowledge' from the service tech's and Google. That is often todays breed I am afraid.
What I usually do is research and try to understand what the front of shop person is suggesting, then go back with some in depth questions and 'superior' knowledge. You will probably find their technical knowledge is completely exhausted, if they had any to start with, and pass you over to their tech. or Service Manager. Certainly with those kinds of figures and a mortgage needed to pay, I would want the top dog. If you are not confident about the answers then you may still have to walk and get another opinion. If you are not confident about what they say, why would you want to let them loose on your bike and pay a shed load of money?
Now to practicalities. They put their diagnostics on your bike and it spat out fault codes from which they gave you these big estimates. I am not saying the diagnostics codes they got were wrong, but their interpretation of the data and what may be the real problem may be. Have you noticed how an older bike seems to get the kiss of death on just about anything? There is always a pre-judgement that gets in the way of getting more facts and making a more accurate diagnosis. They know that even if they got their 'worst case' scenario price wrong, you have accepted that and given them the big budget for parts and work - whatever that is. Nice position to be in when the customer is paying and kept in the dark!
Split the problem to concentrate on the ABS first. I think you should try and get a better qualified opinion. Somebody here who knows your local might recommend. If your ABS unit is faulty, then you can consider the options. Some have been getting their units rebuilt, sometimes they come up on the auction sites or are sold by the boneyards.
I have often wondered what happens if a dealer quotes lots of money to replace an ABS unit, then afterwards gets the same fault and traces the problem to the wiring or computer. Do they charge you up with the original big estimate when the unit removed was not faulty, or do they do the honest thing and tell you? I think I know the answer.
If you are lucky, pick up a used unit and it still gives the same fault (assuming it was good), you have spent less and can still re-sell the unit you bought.
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