RE: Crashed Receivers
I can't answer for a JR receiver, but the Futaba service center charges something like $20 to check out a receiver. I've sent two in so far, and both needed a ceramic filter, an on one, the xtal was bad. Neither cost more than $35 to fix and ship back. I think it was good peace of mind insurance.
They sent me instructions for checking after a crash and it is the same as you did the first time, range check with a running engine.
My rule of thumb is that if I can replace it with a new receiver, cheaper than a repair, it's a new receiver. However, replacing it with a used receiver may put you back in unknown waters again. I don't know what Horizon's charges are, but I expect they are not much different than Futaba's.
Don