1-800-333-DISH (3474). Talk to tech. support. If you are leasing the receiver DISH actually owns the receiver and should take care of you. If you are worried about the service call fees ask about the protection plan.
DISH has not changed their POLICY old hard drives must be on the same account number. You can still use the old hard drives but you must reformat and use them for new recordings.
IS THE GRASS ALWAYS GREENER ON THE OTHER SIDE OF THE FENCE?
Dish hasn't been able to get the 2 tuner dongle to work correctly, why would you want to open that can of worms?
If you really need more than 2 tuners I believe there are non dish products offering up to 8 tuners definitely 4 tuners.