What was found
ON TAKEOFF, RECEIVED ECAM WARNING FOR ADC NR 2 FAULT PITCH TRIM NR 2 TRIPPED YAW DAMP NR 2 TRIPPED, THEN GOT LOW IPIL PRESS ON NR 2 ENG ECAM AND ANALOG GAUGE WAS ZERO, RETURNED TO LANDING PDX. R7R OIL PRESS TRANSMITTER NO HELP AT ALL. FINALLY DISCOVERED THE CB CONTROLLING BUSS BAR 231XP POPPED. RESET AND OIL PRESSURE NOW OK AND ALL OTHER ADC SUFF BACK TO NORMAL.