What was found
AFTER TAKEOFF, LT AC BUS, LT TRU, PETOT HEAT 1, & PUSH SYS FAIL CAUTION LIGHTS ILLUMINATED. RETURNED TO FIELD. AFTER LANDING, NR 1 STALL SYS FAIL AND NR 2 STALL SYS FAIL CAUTION LIGHTS ILLUMINATED. C/W FIM 24-21-00-810-801, R & R THE NR 1 ISOLATOR CONTACTOR IAW TASK 30-61-16-000-802 & 30-61-16-400-802, OPS TEST OF AC VARIABLE SYS GOOD, OPS TEST OF PROP DE-ICE SYS GOOD, OPS TEST OF DC SYS GOOD. PERFORMED AN OPS TEST OF THE STALL PROTECTION MODULE IAW T/C 6273301. OPS CHECK GOOD. A/C REMAINS CAT III QUALIFIED, COCK PIT PLACARD REMAINS CAT III, MX CONTROL NR 68530 HAS BEEN NOTIFIED. C/W OPS TEST OF STALL WARN/PUSHER OPS TEST IAW AMM TASK 27-33-00-710-802. NO DFECTS, NO FAULTS, NO CAUTIONS.