Dear Oliver,
Apart from Patek stating on their site:
The price of the service varies depending on the complexity of the timepiece.
both of us can indeed just make assumptions on how the prices are calculated in detail.
I did not intend to complain about the absolut numbers. I intended to vent my puzzlement about the pricing as I coincidentally just had picked up my wife’s Twenty4 from service. Besides: my puzzlement originated in the fact that the service would comprise a testing of power reserve according to the cost estimate. ;-) My trusted AD explained that with the use of text modules.
Regarding trusted ADs I can confirm your experience: getting battery changes done on my wife’s watches as my contribution to family life I cannot remember to have ever been asked to pay for it by my AD – though I do ask what I should pay of course!
Have a nice weekend,
Christian