I acquired 4 pin-lock corney kegs (and a 20# CO2 tank) while rehabbing an old community center in town last week. The last time they were filled was 5-6 years ago. Two are still pressurized and filled with Coke/Diet Coke, one was empty, and one was only slightly pressurized. How would I go about getting these pressure tested for use? Are there places that do this? I've bottled exclusively to this point, so I don't have any connections or hoses.