Do you have it in a surge protector or UPS as I think it said to use one. I know my TiVo is super sensitive to changes, as they replaced it once, then it still had some issues until I got one.
They probably ship the parts as it is much cheaper than shipping the units. I think UPS from here on the east coast is $440 to ship it oversized. I am sure Grobo gets better discounts than I do, but still going to be a lot.
I already had my back off looking at the air pump, seems easy to get to just take pictures before hand and take your time. I always take before pics showing where the wires and things go if doing something like this.