A B737-300 HAD A RECIRCULATION FAN INSTALLED IN THE FORWARD CARGO COMPARTMENT AFT END. TECHNICIAN FAILED TO SAFETY WIRE THE DUCT CLAMPS.

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I WAS SENT TO HELP INVESTIGATE A VIBRATION ON ACFT XX. AFTER REMOVING THE FORWARD CARGO AFT WALL; MY PARTNER AND I HEARD THE RECIRCULATION FAN FAIL INTERNALLY. WE CALLED FOR A NEW FAN; AND I BEGAN TO REMOVE THE FAILED FAN. AFTER INSTALLING THE NEW FAN AND PERFORMING THE OPS CHK I FAILED TO SAFETY WIRE THE 2 CLAMPS THAT CONNECT THE FAN TO THE DUCT. AT THE TIME I WAS FEELING MODERATE PRESSURE TO GET THE JOB DONE; AS IT WAS A THROUGH FLT. OVER THE NEXT SEVERAL DAYS I CHKED THE HISTORY TO SEE IF THE FAN WAS THE FIX. DURING THE EVENING OF WED I BEGAN TO THINK OF THE CLAMPS AND SAFETY WIRE; AND BECAME QUITE CONCERNED THAT I MIGHT NOT HAVE SAFETIED THE CLAMPS. AT ABOUT XA00; I CONTACTED THE DUTY CTLR FOR ACFT AND TOLD HIM OF MY CONCERN. HE XFERRED ME TO ZZZ1 MAINT; AS THAT IS WHERE XX WAS TO RON (ROUTINE OVERNIGHT CHK). AFTER TALKING TO HIM; HE TOLD ME HE WOULD VERIFY THE SAFETY WIRE ON THE CLAMPS. ON THURSDAY I CALLED HIM; AT WHICH TIME HE TOLD ME THE CLAMPS WERE NOT SAFETIED AND THAT THEY TOOK CARE OF IT.