Air Conditioner just died (I think)

I'm hoping someone can help. We just got back from a week trip to our local mountains and my 3000w generator would not run our 13.5 coleman air-conditioner. The air worked plugged in to a 30amp circuit at my house before we left. When we got home, I plugged it back in to the 30amp and the breaker went off. I opened up the panel on the RV and found the ground wire loose. I tightened and reset the breaker and everything came online (microwave display, TV light, etc.). I tested the microwave and it worked. I turned the Air on and when the compressor tried to come online, I heard a loud sound (pop, then gas escaping) and billowing white smoke came out of the roof unit (My wife said it was scary). Obviously, the compressor would not come on again. I took the cover off the roof unit and noticed oil everywhere around the compressor. Everything else looked okay.

What am I dealing with now and is it serviceable? What cost can I expect.

thanks everyone:)

Andy