Have any Ping users ever had their pump replaced because the screen was becoming difficult to see? We have the contrast as high as it will go and even our Endo commented how light it was. Is this something that Animas will replace the pump for? If so, will it effect the current warranty? Will we get a new pump or a refurbished pump? DD has been wearing the pump for just over 2 1/2 years. Thanks for any insight you can offer.