Now with this i could maybe give a guess.

Now Stormy , here is what you want me to say. It's a stopped up cap tube
drier
which Rheem used 20+ years ago.
CY: Without a filter drier in the liquid line, I was thinking some kind of
restriction in the coil. The distributer tubes (or cap tubes, not sure if
it's a captube or an orifice coil) were warm all through this. So, it seems
to be a problem of some kind in the evaporator. Seems odd that the pressures
would be OK at the condensing unit. However, it's possible that one or two
distributer tubes are clogged, and the other two are flooding. Makes me
wonder if it would cool on a massive under charge? At this point, the plan
of action is to see if he wants to go the expense of changing the
evaporator. Anyhow, I do thank you for your advice and counsell. Sure is
rough to get started in the business without some one to share ideas, and
talk about things.

yes stormy rheem did put a filter drier inside the evaperator coil just before
the cap tubes split off or out of. the Cap tubeholder is a liquid line filter
drier and can plug up just like a liquid line filter drier out at the condenser
unit. And Yes you can over flood the evaperator coil with just 2 of the 4 tubes
open and you will see this with the high head pressure your getting. Here is the
first place to look here.

TURTLE