Refurbished exchange side board for all 5973As and 5973N units without fast scanning electronics. Requires an exchange of customers defective board. RMA issued at time of purchase. A credit of $1500. will be given when AOTI receives customers defective unit. Final price $3374. Replaces new part# G1099-65015. LAN Board is not included. Order G3169-69015-R if replacing a defective side board from a 5973N that has fast scanning capability.