What was found
NR 1 & NR 2 ELECTRONIC ENGINE CONTROL LOGGED SHORT TIME FAULTS 73-31711 & 73-31712. ADIRU1 TAT DATA AND ADIRU2 TAT DATA DISAGREE. REF LOG PAGES 11559807 AND 11559808. ACFT GROUNDED. ACCOMPLISHED FIM 73-28, TASK 808. NO ADIRS OR CDS FAULTS LOGGED. MONITORED TAT AT AMBIENT AND THERE WAS A 3 DEGREE SPLIT. SPLIT EXCEEDED 6 DEGREES AS PROBE HEATED UP TO 99 DEGREES C. R & R TAT PROBE. OPS CHECK NORMAL, REF AMM 34-21-06. AFTER PROBE REPLACEMENT SPLIT WAS WITHIN 1 DEGREE.