main pressure and lock up pressure in HT 750

We use 6 HT 750 and 3 of them have a problems. 1.On 1 and 2 shift main pressure is 400 psi (on another 300), but transducer only till 300 psi. During run transmission on a display appear "low pressure" What is problem in transmission. Is it possible that main pressure 400 psi? 2. On 5 shift transmission doesn't go to lock up. What is pressure should be when transmission go to lock up 3. Transmission 7400. Go out itself lock up when warm. Drain oil. There are bronze chips. What is can be? Thanks
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