I did a leak check again on TM4 today. This time, the leak detector pump to the bottom on both base pressure(0.0xE-4 torr) and base leak rate(0.0xE-9 atm.cc/sec). All high vacuum gauges on TM4 and conditioning station at -6torr range.IG1 is 3.3-6torr,PNG5(top of service cap)is 6.5-6 torr, and the PNG4(bottom of the vessel )is 8.7-6torr. For air to vacuum leak checking, I checked the panel we moved last week on service cap by spraying helium around the panel. There is no any response on leak detector. The panel is leak tight. Also I sprayed helium around the tube heater (+) water cap and blue nylon stand. They are also leak tight. Then, I put 80 psi pressure air to the “D” circuit first. With 80 psi pressure air for 5 minutes, the leak detector has no any response on it. Also all high vacuum gauges stayed at same level .Then I checked it with 80 psi pressure helium for 3 minutes. The leak detector has a response on leak rate with pressure helium same as last time. It climbed from the 0.0xE-9 atm. cc/sec quickly to high -8 range then slow down. The leak rate finally climbed to 2.0 X E-7 atm.cc/sec this time. There is no base pressure change on leak detector. All high vacuum gauge readings no change during the test time. There is a small helium leak at 80 psi pressure test on “D” circuit. But we can not locate it at this stage. Also I don’t want to disturb this circuit any more before the febiad run since this time I saw a little bit increase on leak rate comparing to last time when I checked it. If we really like to find this small helium leak, I would suggest we do it after the febiad run.    Thank you.