I have an old R-15 500 that is acting up again (see precious post Is my r-15 dying?) Now it is flashing a error message "Insert your access card (761) Receiver 0008 4281 3428" The picture and sound pause as this appears and then it is back to normal for a while. The error message is there only momentarily. I have an r-16 in the other room and it is fine. I tried the RBR to no avail! Any ideas???