The air conditioning system in the attic is leaking water. We had someone come out and snake the overflow?

pipes as they thought this was the problem. It didn't fix it. Now, another guy is saying we need a new A/C coil (2 ton) and is giving a quote of $1200 for the coil, connect all duct work to new coil, system start up, clean, vacuum and recharge system. Do you think that the coil is the problem and is this a good price? I don't know the brand and this is the A/C for the second zone in a two-zoned house.