Transmission debris

["NJPIII" <NJPIII@xxxx>]

Hello all my first post here looking for some help 
Part time DMC tech full time service Mngr at Delorean Cadillac yes 
there is a relationship older brother of John owns dealership.
have a car here which used to have a single turbo. Installed veh 
trans was sent out 2 years ago for overhaul as trans could not take 
power from the turbo and lost all gears,car sat finally installed 
trans was done by rob at PJ Grady driven for about 40 miles then 
started losing gears, installed pressure gauge and find it loses 
almost all pressure after 20 seconds after starting,removed pan found 
xs debris blocking filter, cleaned reinstalled and tested again ok 
for about 4 miles then problem starts all over again have a nos 
valvebody installed it and same condition again ???