It's the green antifreeze coming out from the drain hose. Fortunately it's dripping on the garage floor rather than the carpet. The repair shop was double-checking the hours quoted with another shop since you are correct about the evaporator effort (which is also another problem area).

Are you aware of being able to repair the cores since other post indicate leak developing where the aluminum core is attached to the plastic end caps? Possibly using a marine grade epoxy. This is a longshot--