I have a 2002 Chevrolet Silverado 6.6L duramax with Allison transmission. My transmission is given me 5 codes po711 transmission temperature sensor circuit out of range. Po748 pressure control solenoid. Po778 pcs B circuit. Po561 System voltage unstable. Po880 TCM Power lnput signal. Can any of you guys tell me what these codes mean maybe point me in the right direction. Thanks Jr