If the camcorder is out of its guarantee period JVC will only repair it if the owner is the original purchaser, so if Curry's / Comet has sent a camcorder back to JVC and got it repaired then its either been still in guarantee OR its been done as a goodwill gesture by a particular store for a known customer, something I am sure that JVC would not have willingly approved of. (if reason was known!)
JVC are quite strict on the original ownership angle, this designed to stop dealers exploiting the offer by buying up faulty camcorders at knock down prices, getting them repaired, then making the proverbial "quick buck" on a re-sale.