What was found
ON TAKEOFF ROLL CAPT'S PFD, NAV DISPLAY, NR 1 YAW DAMPER, NR 1 IRU FAILED. REMOVED, REPLACED AND THEN OPS CHECKED NR 3 IRU AS PER A-310 M/M 34-25-00-5 AND 34-25-14 OKAY FOR SERVICE. R/I FROM FACT PREMATURE REMOVAL/INSTALLATION OFF MFG 461600-0800-0801, POS 3 SRL 0093, TAG 999804 ON MFG 461600-0800-0801 SRL 0359, TAG 999737.