Testing for Inlet Leaks

Performed several leak checks on inlet fittings
First discovery: that through-tube fitting with telon ferrule was loose at altitude
Tightened, around ... 19:40?
Second discovery.  Breath tests seem to result in elevated CO2, lowered O2

19:40-->19>43? Saw gradual increases in CO2 and O2.  Tightened 1/4" fitting to through-tube
19:46-->19:49? Same again.  Tightened a bit more, now on all fittings
19:58-->20:02? Same again.  Tightened all 1/4" fittings a bit more
20:10-->20:13  Same again.  This time, not seeing rise.  However, might be covered by natural lower vals in O2 and CO2

Must address on ground