Did the second shop you took the car to yesterday give you an opinion, or confirm the low compression? Cylinder #2 is not an easy one to get to (middle rear), but a shop should be able to do it. I'm sure they'll charge you some labor for it though which I assume you expect. It would be a bit unusual for compression to drop only when the engine is warm. If the shop is unable to duplicate the low compression, suggest they swap the spark plug from #2 cylinder with one from maybe cylinder #5. And, if the #2 plug wire is comparable in length to another cylinder, suggest they swap those around. If you really want to get to the bottom of this you could have them swap fuel injectors, but that's quite a bit more work See if the misfire code follows the spark plug, plug wire, injector if you go that far, or remains on cylinder #2.
-Rod