AFTER RETURNING FROM A FIELD TRIP FOR REPAIR OF #1 ENGINE FAN BLADES; ON A B737-300; MECHANIC IS INFORMED THAT THE POSITION OF THE SPECIFIC FAN BLADES REPLACED WAS NOT ENTERED IN THE COMPANY MAINT COMPUTER.

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I WAS SENT TO THE ARPT TO DO SOME FAN BLADE BLENDING. WHEN I LOOKED AT THE FAN BLADES ON ENG #1; 4 PAIRS HAD BEEN (8 EACH BLADES) REPLACED. I LOOKED AT THE LAST FAN BLADE #19 AND IT HAD BAD DAMAGE; OUT OF LIMITS. ITS OTHER OPPOSITE FAN BLADE HAD MINOR BLENDABLE DAMAGE. A BLADE PAIR WAS THEN REPLACED. I WAS WORKING ON OVERTIME AFTER A 10 HR SHIFT. I WAS ASKED BY LCL MGMNT TO DO AS MUCH AS I COULD TO HELP THEM OUT. I WAS TIRED WHEN TRYING TO INPUT THE DATA AND AS I NOW UNDERSTAND THAT I AM NOW BEING INVESTIGATED. I DID NOT HAVE MUCH SUPPORT FROM ZZZ. MY INPUTS ON INFO ENTERED IN RELATION TO THE LOG ITEMS MAY NOT HAVE BEEN ACCURATE. I WAS TOLD THAT LCL MAINT WOULD TAKE CARE OF THE REST OF THE ITEMS. I THEN RETURNED BACK TO WHERE I'M BASED. I WAS NOTIFIED OF A PROB LAST NIGHT AFTER I RETURNED A PHONE CALL TO MY BOSS THAT A PROB HAS OCCURRED AND TO CONTACT LINE MAINT AS SOON AS POSSIBLE. I WAS TOLD THAT QUALITY CTL AND FAA ARE NOW INVOLVED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED HE HAD JUST FINISHED REPLACING THE #1 ENGINE FAN BLADE AT POSITION #19 AND THE OPPOSITE BLADE DUE TO BLADE DAMAGE WAS BEYOND THE SRM MANUAL. HE HAD NOT FINISHED SIGNING-OFF THE PAPERWORK FOR THE BLADE REPAIR WHEN HE WAS ORDERED BY THE FIELD STATION DUTY SUPERVISOR TO OPEN UP #1 ENGINE COWLING AND PREPARE ENG FOR A BORESCOPE INSPECTION. REPORTER STATED HE TOLD SUPERVISOR HE WANTED TO FINISH SIGNING-OFF THE PAPERWORK FOR THE FAN BLADE WORK FIRST; BUT WAS AGAIN TOLD TO OPEN THE ENGINE IMMEDIATELY. AS A RESULT OF BEING DISTRACTED TO PERFORM OTHER ENG MAINTENANCE AND WORKING OVERTIME BEYOND THE TEN HOUR SHIFT HE HAD JUST COMPLETED; HE DID NOT ENTER THE SPECIFIC FAN BLADE POSITIONS HE HAD REPLACED INTO HIS CARRIER'S MAINT SYSTEM DATABASE. REPORTER STATED ALTHOUGH THE ACFT HAD BEEN RELEASED INTO SERVICE; ONCE MAINT CONTROL BECAME AWARE OF THE INCOMPLETE MAINT DATA ENTRY AND THE MULTIPLE BLADE CHANGES THAT HAD ALREADY BEEN ACCOMPLISHED ON #1 ENGINE; A COMPANY DECISION WAS MADE TO REPLACE THE ENTIRE FORWARD FAN BLADE SECTION AT A DOWNLINE MAINT STATION.