Ge Geospring water heater repair

My Geospring heat pump has gone out after 2 years. Based on the fault code, GE sent a new evapaorator and drier under warranty, but there are no instructions. Also nothing on GE site to download. I have someone who works on sealed systems coming Saturday through Lowes Extended service program. I haven't been able to talk to the guy, so not sure if he has ever worked on a Geospring. Do you have any tips I can pass along? How is the top plastic shroud removed to get at the heat pump internals?
Thanks,