Air servo mix damper

My car's air system just started putting out extremely hot air whether in cold mode or if the A/C is on. I took to local Toyota dealership was told that the air servo mix damper needs to be replaced. I'm fine with the $200 quote for the piece itself but was told that it was a minimum 5 hour project because the dashboard needed to be removed. I was told that labor alone would cost almost $1500! Does this sound right? Money is tight and I would like it fixed but wanted to make sure that they weren't taking advantage. Thank you!