Get a 2nd opinion before going back to that Dealer. It might be you didn't understand what they told you fully, and your having trouble relating the problem to us, or this Dealer is ripping you off. Sadly, we've seen enough bad Dealer's that is a possibility.
You can do the "Key Dance" to get the fault codes stored in the computer module to read out for free. Any auto store will have code readers that they will plug and read the stored codes for you for free.
I have trouble believing they need $2600 just to diagnosis which cylinder is leaking, let alone that you have a leaking cylinder.
If you're NOT able/willing to do a little double checking of the codes and troubleshooting on your own, find another shop, preferrably a reputable independent one with recommendations and have them take a look at it. A $2600 quote, and that isn't even a final repair, warrants a 2nd opinion from another shop.
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