You should find out what is going on with the pickup selector and if anything else has been modified, and take a look inside the electronics cavity to make sure things look right. Also play it and see if there is any excessive noise that might suggest the need for the electronics upgrade, which will add to your cost. Also check it out to see if there are any cracks in the wood, especially around the heel and head. Series basses are very nice, but make sure you evaluate the condition and factor in any potential repair costs. And as mentioned above, if it is missing the power supply and cable, that will add to your cost as well.