AN L1011 WAS DISPATCHED IN NON COMPLIANCE WITH AN OPEN LOGBOOK RPT ON THE CABIN ALT WARNING SYS INADVERTENTLY OVERLOOKED.

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I WAS ASSIGNED TO WORK ON ACR ACFT X; AN L1011. THE ACFT HAD AN INBOUND WRITE-UP ON CABIN PRESSURIZATION. I WAS FAMILIAR WITH THIS ACFT AND ITS EXTENSIVE CABIN PRESSURIZATION HISTORY AS I HAD WORKED IT ON A PREVIOUS OCCASION. THE ACFT ALSO HAD ITS FORWARD OUTFLOW VALVE ON MAINT CARRYOVER IN ACCORDANCE WITH THE MEL. AFTER CHKING THE SYS OUT; I DETERMINED THE FORWARD OUTFLOW VALVE ACTUATOR TO BE AT FAULT. I REPLACED THE ACTUATOR AND; AFTER THE APPROPRIATE CHKOUT; I SIGNED THE ITEM OFF AND RELEASED IT FOR SVC. HOWEVER; THE INBOUND WRITE-UP ALSO ADDRESSED IMPROPER OP OF THE CABIN ALT WARNING SYS. SINCE I WAS FAMILIAR WITH THE HISTORY AND WAS EAGER TO FIX THE PRESSURIZATION PROB; I FAILED TO FULLY READ AND COMPREHEND THE SIGNIFICANCE OF THE CABIN ALT WARNING SYS DISCREPANCY AND I DID NOTHING TO ADDRESS THAT ASPECT OF THE WRITE-UP. THE ACFT WAS DISPATCHED AND FLEW WITH NO DISCREPANCY. THE FOLLOWING DAY; A LATE NIGHT SHIFT LEAD TECHNICIAN BROUGHT THIS ALL TO MY ATTN. I IMMEDIATELY NOTIFIED THE MAINT COORDINATOR CTR OF MY ERROR AND HAD THEM PUT A SET-UP IN THE OPERATIONAL MAINT INSTRUCTIONS TO HAVE THE CABIN ALT WARNING SYS CHKED OUT.