A B757-225 HAD AN ENGINE IDG REPLACED WITHOUT THE REQUIRED INSPECTION CHECK ACCOMPLISHED PRIOR TO DISPATCH.

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I CHKED ON HIS PROGRESS BEFORE THE MEETING; HE SAID THE CHK WAS ABOUT DONE AND THE CHIP DETECTORS WAS DONE. I ASKED ABOUT THE LOG ITEM AND HE SAID IT WAS BEING TROUBLESHOT. I ASSIGNED MECH X TO ACFT X. THE ASSIGNMENT WAS A CHK; CHIP DETECTORS AND LOG ITEM; 'L GEN INOP.' ZZZ1 REVIEWED THE LOGBOOK AND DISCOVERED IT. UPON MY FIRST DAY BACK TO WORK FROM MY DAYS OFF; I WAS HANDED A DISCIPLINE FORM AND TOLD I WAS BEING SUSPENDED FOR 1 DAY STARTING THE NEXT DAY. PUTTING COLORED TAGS ON RII COMPONENTS WHEN THEY GO THROUGH RECEIVING INSPECTION; SO THE INSTALLING MECH WILL KNOW THIS IS RII ITEM. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ENGINE IDG WAS REPLACED ON PRIOR SHIFT. THE MAINTENANCE TURNOVER TO THE ONCOMING SHIFT STATED THAT ONLY THE CHIP DETECTORS NEEDED TO BE CHECKED; ALL OTHER WORK WAS COMPLETED. THIS REPORTER WAS PART OF THE ONCOMING SHIFT AND NOTIFIED LATER HE HAD NOT CALLED OUT FOR A REQUIRED INSPECTION ITEM. THE RII FOR THE IDG WAS ACCOMPLISHED AT ANOTHER STATION. NO FLIGHT DISCREPANCIES AS A RESULT OF THE IDG CHANGE.