Your math is also a bit flawed. Or not the whole picture, at least.
But, in the end, it doesn’t really matter because it’s a $499 service. It doesn’t matter to me what the tube costs them, or what they retail it for, or what they charge as a labor rate, or what they pay the employee doing it.
In the end, @metaldrummer13 paid $278 extra and he doesn’t know for what. This isn’t right. It also prevents him from knowing the history of his machine.
I don’t have the warranty pulled up at the moment / but there should be a warranty for repairs also (not sure if it just states spare parts, replacement parts, etc.) - but if he has an issue in 2 months: let’s say it was the lid that was the extra repair dollars, and the lid started coming unglued again in 2 months, if the warranty guarantees repairs for 3 months, he would be covered, but he doesn’t actually know what was repaired - so he’s left in a complete position of ignorance because he wasn’t provided the original repair details.