I have a MKIII 60 watt head I almost sent in for the C+ mod and was told $200 for the mod and anywhere from $75-150 roughly for a cap job/tune up depending on how much work needs to be done. Decided I really like the MKIII's tone and just sent it in for the caps and tune up. Don't know if a MKII would be different cost wise. To be sure, call Mesa. They were really helpful for me.