Tube Tester Repair

I am trying to find a technician who can check over my Lafayette TE-50 tube tester. I have been buying/trying NOS 5751 and 12au7s for my C-J PV-11. Before installing them in the C-J I have been checking these and each one shows gas leaks on pins 3 & 5. Too much of a coincidence to believe this is accurate. I'm in Northern Westchester Cty, NY about 60 miles out of NYC. I would prefer to deliver/pickup as opposed to ship. Any recommendations would be appreciated.
Thanks in advance for your replies.