MECHANIC IS INFORMED HIS LOGBOOK SIGNOFF MAY HAVE BEEN INCOMPLETE AFTER THE INSTALLATION OF A HYD TEMPORARY LINE AND SWIVEL FITTING ON THE #6 SLAT ACTUATOR OF A B737-700 ACFT.

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WE CALLED MAINT CTL TO CHK IN AND TO TRY TO GET AN IDEA OF WHAT HISTORY THE ACFT HAD. AFTER DISCUSSING WHAT MAY HAVE CAUSED THE LEAK; WE DECIDED TO RUN HYDS. SO; WITH X IN THE COCKPIT AND ME ON THE GND; WE RAN THE 'B' SYS HYDS AND QUICKLY NOTICED THE FLUID LEAK OUT OF THE #6 SLAT ACTUATOR. AFTER SHUTTING DOWN HYDS AND DOING A QUICK CLEAN-UP OF THE SLAT AREA WE DEPLANED TO GET A LITTLE MORE ACCESS TO THE LINES AND THE ACTUATOR. WE RAN HYDS AGAIN AND I NOTICED THE FLUID COMING OUT OF THE INBOARD HYD LINE B-NUT THEN DETERMINED THAT BEING THE CAUSE OF THE LEAK. SUSPECTING THAT IT WAS SIMPLY A LOOSE B-NUT; I ATTEMPTED TO SECURE THE LINE AND WHILE DOING SO NOTICED THAT THE LINE WAS CRACKED. SINCE THIS WAS THE SECOND OCCURRENCE OF A BROKEN LINE ON THE #6 SLAT ACTUATOR; WE DECIDED THAT PERHAPS THE SWIVEL WHERE IT ATTACHES TO MIGHT BE THE CAUSE OF THE PROB AND DECIDED THEN TO CHANGE BOTH THE LINE AND THE SWIVEL. AFTER CALLING MAINT CTL AND ASKING THEM TO SEND US A NEW LINE AND SWIVEL; IT WAS DETERMINED THAT WE WERE 'NOT IN STOCK' ON THE LINE AND THAT THE SWIVEL WOULD ARRIVE SOMETIME LATER ON IN THE NIGHT. WE CLEANED UP AND WAITED FOR OUR PART. AFTER THE PART ARRIVED WE PROCEEDED WITH THE REMOVAL OF THE LINE AND THE SWIVEL. WE INSTALLED THE NEW SWIVEL AND A TEMPORARY HYD SIMULTANEOUSLY BECAUSE OF THE LIMITED AMOUNT OF WORK SPACE AND VISIBILITY. SECURED THE LINE TO THE ACTUATOR AND THEN DID OUR LEAK AND OPS CHKS PER THE MAINT MANUAL. AFTER COMPLETING OUR CHKS AND FEELING SATISFIED WITH THE RESULTS; WE INSTALLED THE ACCESS PANELS AND WENT INTO THE ACFT TO SIGN OFF THE LOGBOOK. MY SIGNOFF CONSISTED OF THE DISCOVERY OF THE #6 SLAT ACTUATOR RETRACT LINE CONNECTED TO SWIVEL AS BEING CRACKED. I ALSO INCLUDED THE INSTALLATION OF THE TEMP-LINE AT THE #6 ACTUATOR RETRACT PORT. I FELT THIS SIGNOFF TO BE PRECISE AND CONCLUSIVE WITH REGARDS TO THE AMOUNT OF WORK THAT WE PERFORMED. ONLY; VERY RECENTLY I HAVE BEEN INFORMED; THAT PERHAPS MY SIGNOFF MAY BE SOMEWHAT INCOMPLETE. REFLECTING BACK ON THE EVENTS THAT OCCURRED LEADING UP TO MY SIGNOFF; I HAVE TO AGREE THAT PERHAPS A MORE THOROUGH DESCRIPTION SHOULD HAVE BEEN WRITTEN. THE FACT THAT THE SWIVEL WAS INDEED REPLACED FOR PRECAUTIONARY MEASURES SHOULD HAVE BEEN INCLUDED IN MY SIGNOFF. I NOW REALIZE THIS FACT AND AGREE THAT MY LOGBOOK SIGN WAS INCOMPLETE.