RE: Can a Receiver(Rx) get failed during flight
Hobbico (Futaba) charges $15 to test a RX plus $9 for ship/handle and figure $6 to ship it to them for a total of $30 plus any repair charges.
A new R168DF from Tower is $60 plus shipping.
Almost forgot, since you're not getting it checked out get a new crystal too at @ $13