What was found
BLEED AIR NR 1 FAULT WITH ANTI-ICE SELECTED AFTER SELECTING WITH ANTI ICE THEN BOTH PACKS WOULD FAULT AND NOT RESET COULD NOT MAINTAIN CABIN PRESSURE WITH APU BLEED NR 2 BLEED WAS DEFERRED NR 1 ENGINE BLEED WOULD NOT RESET. UNSCHEDULED LANDING T/S PER A310 TSM BITE NR 1 & 2 PSC PRIOR TO AND AFTER NR 1 ENG GROUND RUN, OPENED NR 1 ENG COWLING TO INSPECT BLEED AIR DUCTING FOR LEAK AND SECURITY NO DEFECT NOTED. GEAR PINS INSTALLED AND REMOVED AFTER ENGINE RUN. (OPEN)