a tip for finding leaks a little soapy water goes a long way where bubbles are there is a leak.
the first area I would check is the fill valve when I first installed my Robarts the valve core in the center of the filler was not tight enough and was leaking it doesn't need to be over tight but at least snug inside the filler valve.
the second place would be the actuation valve to see if there is a leak .
then pump it up and a couple of drops of soapy water to check the T's and connections for any possable leaking spots,if your loosing air that fast its going to be a major area not one of the T's the fill valve,the actuation valve, or the gear themselvs this is where I would start first,process of elimination.
off the top of my head I don't remember which barb does what.