A B737-400 WAS RELEASED FROM A HVY CHK IN CAT IIIA AUTOLAND STATUS. LATER WAS FOUND TO HAVE 2 LOG RPTS ON AUTOLAND PERFORMANCE.

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ON MAY/TUE/05; I WAS ASSIGNED TO ACFT X BY MY LEAD TO COMPLETE 3 CAT DOWNGRADES AGAINST THE ACFT. OUR ROUTINE OVERNIGHT CHK SCHEDULE AND ACFT X MAINT ITEMS WRITE-UP'S 100 WORK PACKAGE PAPERWORK FOR FO'S EADI CAT DOWNGRADE LOG PAGES WERE SIGNED OFF STATING; 'FUNCTIONAL CHK EADI REF 34-22-21 AND 34-22-00 OPS NORMAL REF SAME. BITE #48 GOOD. HGS 4.2 GOOD REF 34-36-00. REF LOG PAGE X FOR ACFT FULL UPGRADE.' IRU'S CAT DOWNGRADE LOG PAGE WERE SIGNED OFF STATING; 'FUNCTIONAL CHKED IRU'S REF MAINT MANUAL 34-28-31 OPS NORMAL REF SAME. GROUP BITE #33 GOOD. HGS 4.2 REF 34-36-00 GOOD. ACFT UPGRADED TO CAT IIIA AUTOLAND AND HGS STATUS SCREW SHOWS SAME.' UPON COMPLETING THE MAINT ITEM WRITE-UP 100'S AND 2B'S PAPERWORK; MAINT CTL WAS CALLED AND I CONSULTED WITH MR X. I INFORMED HIM THAT THE 3 CAT DOWNGRADES WERE COMPLETED. ACFT X CAN BE UPGRADED AS LONG AS THERE IS NOTHING AGAINST THE ACFT. HE SAID ONLY THESE 3 CAT DOWNGRADES WERE AGAINST THE ACFT AND WE AGREED ACFT X CAN BE UPGRADED TO CAT IIIA AUTOLAND AND HGS. (NOTE: UPON UPGRADING ANY ACFT; I ALWAYS ASK THE MAINT CTLR IF THEY SHOW ANYTHING AGAINST THE ACFT PREVENTING THE UPGRADE TO THE ACFT.) ON THE EVENING OF MAY/WED/05; OUR RPT PROGRAM REPRESENTATIVE; MR Y; INFORMED ME ACFT X HAD 2 CAT DOWNGRADES AGAINST THE ACFT FROM APR/TUE/05 WHEN THE ACFT WENT INTO HVY CHK REF LOG PAGES XXX AND YYY. THESE 2 LOG PAGES WERE NOT KNOWN TO ME AND MAINT CTL DID NOT SHOW THEM AGAINST THE ACFT. I DID NOT GO BACK INTO THE ACFT HISTORY TO SEE IF ANY OTHER LOG PAGES WERE AGAINST THE ACFT. THE NAV AND AUTOPLT WORK CARDS HAD NOT BEEN ISSUED TO THE ACFT SINCE COMING OUT OF HVY CHK; AND AT SOME TIME THE CAT STATUS SCREW WAS NOT MOVED TO THE STOW POS IN HVY CHK OR WAS MOVED TO FULL CAT IIIA AUTOLAND AND HGS POS BEFORE THE FIRST CAT DOWNGRADE WAS PUT AGAINST THE ACFT BECAUSE OF THE STATEMENTS IN THE FIRST 2 DOWNGRADES STATING; 'ACFT DOWNGRADED TO CAT I (STOW POS); SCREW MOVED TO REFLECT SAME.' A NEW LOG PAGE WAS COMPLETED RE-DOWNGRADING THE ACFT TO CAT I STATUS; REQUIRING WORK CARDS TO BE COMPLETED.