On 2003-04-09 I sent a Linksys Network PC Card (WPC11) to Linksys for repair.
(It had fried when "Windows Update" found an update for it and I (perhaps foolishly) said "go ahead, install it ... make my day!")

I easily found their RMA page and generated an RMA (Return Merchandise Authorization) for it.

I didn't include a receipt, since I couldn't find it. Nonetheless, they speedily replaced it with a working card, at no cost.

Thanks, Linksys!