AN ATR72 ON TKOF CLB AT 1000 FT #2 ENG INTERNAL TURBINE TEMP WENT TO 770 DEGS. MAX LIMITS PER THE ACFT OPERATING MANUAL IS 765 DEGS. RETURNED TO THE DEP ARPT.

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DURING THE TKOF ROLL; THE #2 ITT READ HIGHER THAN USUAL BUT STILL UNDER THE MAX LIMIT OF 765. WE ROTATED; AND DURING THE INITIAL CLB; IT STARTED TO INCREASE AND WAS GETTING VERY CLOSE TO 765. THE PWR MGMNT WAS SELECTED TO CLB AT 800 FT AGL. THE INCREASE OF ITT SLOWED; BUT AS WE PASSED 1000 FT; IT WENT OVER 765 TO STABILIZE AT 770 FOR A FEW SECONDS. I POINTED THIS OUT TO THE FO. IT FINALLY DECREASED TO 707. WE RETURNED TO ZZZ NOTIFIED MAINT CTL AND OPS; AND MADE AN ENTRY IN THE ACFT BOOK. THE FOLLOWING DAY; I WAS CALLED INTO THE CHIEF PLT'S OFFICE TO EXPLAIN WHAT HAPPENED. I WAS TOLD THAT MAINT SAID THAT; ACCORDING TO THE ACARS; THE ITT DID NOT EXCEED 754. I WAS SURPRISED SINCE BOTH; THE FO AND MYSELF; READ 770 OFF THE ITT GAUGE. MY DECISION TO RETURN TO ZZZ AND MAKE AN ENTRY IN THE ACFT LOGBOOK IS SUPPORTED BY WHAT WE OBSERVED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE INTERNAL TURBINE TEMP (ITT) WAS READ DIRECTLY BY BOTH CREW MEMBERS FROM THE INTERNAL TURBINE TEMP INDICATOR WHICH IS CALIBRATED TO THE ENG. MAINT DISPUTES THE TEMP RECORDED IN THE LOGBOOK AND STATES THE MAX TEMP AT 754 DEGS CITING ACARS DATA XMITTED TO THE CTR. THE RPTR STATES THE INDICATOR IS THE MOST ACCURATE AND THE DATA SENT BY THE ACARS IS SENT AT PROGRAMMED INTERVALS AND PERHAPS WAS SENT DURING AN INTERVAL WHEN THE TEMP WAS IN FACT 754. THE MAINT CTR MUST HAVE CHKED THE ENG USING THE 754 DEG TEMP AS MAX AS THE AIRPLANE WAS ROUTED OUT ON A TRIP WITHIN 2 HRS. THE MAINT ACTION TAKEN IF ANY IS UNKNOWN BY THE RPTR.