A B777 WAS RELEASED FOR SVC WITH 3 OPEN MAINT WRITE-UPS. ACFT WAS UNDERGOING 2 MAINT CHKS SIMULTANEOUSLY AND RPTS WERE ENTERED ON AN INCORRECT FORM.

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ON FEB/MON/05; I RELEASED ACFT X TO SVC FROM A TIME CTLED SVC CHK AND 'A' CHK WHEN THE WORK PACKAGE HAD 3 OPEN NON ROUTINE ITEMS. WE STARTED ACCOMPLISHING THE TIME CTLED SVC CHK IN ZZZ 3 WKS AGO. SINCE THE START; WE'VE UTILIZED THE TECHNICIAN'S NON ROUTINE WRITE-UP FORMS TO DOCUMENT NON ROUTINE DISCREPANCIES DURING THE TIME CTLED SVC CHK. IF AN 'X' CHK OR 'A' CHK IS CONCURRENTLY ASSIGNED; WE STILL DOCUMENT ALL NON ROUTINE ITEMS ON THE TECHNICIAN'S NON ROUTINE WRITE-UP FORM (WE DO NOT USE THE NON ROUTINE PAGES AT THE BACK OF THE 'X' CHK OR 'A' CHK). ON THE NIGHT OF FEB/MON/05; A CONTRACT EMPLOYEE FOR COMPANY Y DOCUMENTED 3 PAX ENTERTAINMENT VIDEO COMPONENT DISCREPANCIES ON THE NON ROUTINE PAGES AT THE BACK OF THE 'A' CHK WORK CARD. THESE ITEMS WERE MISSED BY THE TIME CTLED SVC CHK CREW AND MY REVIEW OF THE WORK PACKAGE FAILED TO IDENT THESE 3 ITEMS SINCE WE WERE ALL FOCUSING ON TECHNICIAN'S NON ROUTINE WRITE-UP FORMS. WHILE THESE ITEMS DID NOT AFFECT SAFETY OF FLT; THEY WERE ITEMS COVERED BY OUR FAA APPROVED PRIORITY DEFERRAL LIST PROGRAM.