Alright guys I need a little help. I have a customer with a PG that went to the track and it performed great for 5 runs and then backed up out of the lights. So I had him check the band adj. and it was 3 to 3 1/2 turns out. So I ask him to hook up a gauge on the servo port and 1st gear has 245psi but when you apply the transbrake the pressure drops to 50psi for about 1.5 seconds and then comes back up to 245psi. I've ask him to put it on stands and check the pressure on the shift from 1st to 2nd to see if the pressure drops, but it will be a couple of days before he can get to it. It has a dual ring servo with steel rings and a jw case. I'm wondering if it could be in the valve body. Any help would be thankful.