A B737-700 HAD 2 STABILIZER PULLEYS REPLACED WITH NO RIGGING REQUIRED. NO REQUIRED INSPECTION WAS ACCOMPLISHED. RPTR BELIEVES NONE REQUIRED.

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ACFT WAS BROUGHT TO THE HANGAR AFTER AN AIR TURNBACK. IT WAS RPTED THAT ONE OF THE FLT ATTENDANTS HEARD A METALLIC POPPING NOISE IN THE FORWARD GALLEY FLOOR AREA. WHILE INSPECTING THE AFT E&E COMPARTMENT FOR ANY PROBS; I FOUND THAT 2 OF THE STABILIZER TRIM PULLEYS WERE BADLY WORN. WHEN THE PULLEYS WERE TURNED; THEY MADE A LOUD CLACKING NOISE AGAINST THE CABLES. SO; I DECIDED TO CHANGE BOTH PULLEYS. BECAUSE OF THE POS OF THESE PULLEYS AND THE ROUTING OF THE CABLES; THERE IS VERY LITTLE PRESSURE BTWN THE PULLEYS AND THE CABLES. IT IS A VERY SIMPLE TASK TO REMOVE THE PULLEY BOLTS; DROP THE WORN PULLEYS OUT; SLIDE THE NEW PULLEYS IN PLACE AND REINSTALL THE PULLEY BOLTS. SINCE I DID NOT DISTURB THE CTL CABLES; NO RIGGING WAS NEEDED. I DID USE A TENSIOMETER TO CHK THE CABLE TENSION TO MAKE SURE THEY WERE WITHIN LIMITS. THERE ARE 3 TASKS LISTED IN THE MPM CONCERNING THE STABILIZER SYS THAT REQUIRE AN RII: 1) R&R OF THE HORIZ STABILIZER JACK SCREW. 2) RIGGING THE CTL SYS. 3) STABILIZER REPLACEMENT. SINCE I DIDN'T PERFORM ANY OF THESE TASKS; I DID NOT THINK THAT AN RII WAS NEEDED. MY REF TO THE MAINT MANUAL WAS FOR STANDARD PRACTICES CONCERNING THE INSTALLATION OF THE BOLTS AND SELF-LOCKING NUTS FOR THE PULLEYS; AND CHKING THE CABLE TENSION.