A B767-300 RPTED A FLAG ON THE FO'S ALTIMETER AT FL370. TECHNICIAN GIVEN MESSAGE IT WAS RADIO ALTIMETER FLAG. REPLACED #3 RADIO ALTIMETER UNIT.

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ITEM CALLED IN BY FLT CREW ON ARR. FO'S RADIO ALTIMETER FLAG IN VIEW AT FL370 THROUGH FL280. SWITCHED TO ALTERNATE; FLAG OUT OF VIEW (THIS IS THE MESSAGE THAT I RECEIVED). THE ACTUAL WRITE-UP WAS (FO ALTIMETER FLAG IN VIEW AT FL370-FL280; SWITCHED TO ALTERNATE SOURCE; FLAG OUT OF VIEW). AFTER I GOT TO THE ACFT; FLT CREW WAS NOT PRESENT. I NOTICED THAT THE FO'S RA LIGHT WAS ON; ON HIS UPPER EICAS SCREEN. I THEN CYCLED THE #3 RADIO ALTIMETER CIRCUIT BREAKER; THE LIGHT WENT OUT AND CAME BACK ON. I THEN PROCEEDED TO THE FORWARD CARGO PIT WHERE THE RA CTLRS ARE LOCATED. I PROCEEDED TO DO A TEST ON THE CTLR; WOULD NOT TEST. SO I THEN ORDERED A RADIO ALTIMETER CTLR AND REPLACED THE #3 RA CTLR; AND DID A TEST AND IT PASSED. I THEN SIGNED OFF THE LOGBOOK WRITE-UP; NOT MORE CAREFUL WHILE READING THE ACTUAL WRITE-UP. I HAD IN MY MIND THINKING THAT I WAS TOLD THAT IT WAS THE RADIO ALTIMETER THAT CAME INTO VIEW; AND THINKING THAT IT WAS KIND OF A WEIRD WRITE-UP; BECAUSE THE RA'S PURPOSE IS TO NOTIFY THE FLT CREW FROM ABOUT 1500 FT AGL TO TOUCHDOWN. I THOUGHT IT TO BE WEIRD; BUT HAVING SEEING DIFFERENT AND OTHER WEIRD WRITE-UPS BEFORE; I JUST FIGURED THAT SOMETHING WEIRD HAPPENED BTWN FL370-FL280 AND THAT THEY GOT THIS FLAG ON THE RADIO ALTIMETER. I NOW REALIZE THAT IT WAS THE FO'S ALTIMETER; NOT THE RADIO ALTIMETER; THAT WAS THE PROB AND I SHOULD HAVE REPLACED THE ADC. AFTER VIEWING HISTORY OF THIS PROB; THERE WAS NO HISTORY AND AS OF XA00; MAR/FRI/05; THERE WAS AND IS NO MORE PROBS FOR THIS PARTICULAR PROB ON THIS ACFT. A MISUNDERSTANDING OF VERBAL COM WAS PART OF THE PROB. THIS INCIDENT WAS BROUGHT TO MY ATTN BY OUR B767 MAINT COORDINATOR.