Cant find source of trans leak

[Rapom]

The trans/xfer vent under hood was missing the vent cap when i acquired the kick. I put one on from a donor vehicle. Its possible dirt snd debris got into the line clogging it. Im ass-u-me-ing that using compressed air at the end of that hose is a huge no no. Accessing the top nipple on the trans looks to be next to impossible without removal of trans? Trans fluid level always checked hot/running on level surface