What was found
SPEED TRIM FAILED AND MACH TRIM LIGHT ILLUMINATED AFTER PUSHBACK DURING RECALL. ACFT GROUNDED. AFTER POWER DROP OFF AT GATE FAULTS SHOWED ON RECALL, SPEED TRIM, MACH TRIM FAIL. PERFORMED DFCS BITE SHOWED FAULTS 11101, 11102, 11302, 11321. POWERED DOWN ACFT, SWAPPED FCCS THEN SWAPPED FCC'S BACK IAW AMM 22-11-33-000-801 & 22-11-33-400-801. WAITED FIVE MINUTES FOR POWER UP. PERFORMED DFCS BITE TEST AGAIN IAW FIM 22-11 TASK 801. TEST PASSED. ACFT OK FOR SERVICE.