What was found
(CAN) A/C DEPARTED SMITHERS, BC ENROUTE TO VANCOUVER. AT APPROX 15 MIN. OUT A PASSENGER NOTED TO CREW THAT RT WING HAD A SMALL LEAK OF FUEL COMING FROM A RIVET HEAD JUST O/B OF ENGINE NACELLE. THE CREW HAD NO IND.S OUT OF ORDINARY BUT AFTER CONFERRING WITH MAINT OVER RADIO THEY ELECTED TO RETURN TO SMITHERS AS A PRECAUTIOINARY MEASURE: EMERG SRVCS WHERE STANDING BY & THE A/C MADE AN UNEVENTFUL LDG. LEAK WAS ONLY EVIDENT BY SOME WEEPING ON R/H WING & MUST HAVE BEEN GREATER WITH WING LOADING & AIRPRESSURES IN FLT.MAINT DEFUELED A/C ANDINVESTIGATED INTERNAL AREAS OF WING. SOME RIVETS WHERE SEALED IN AREA OF WEEPING & A LEAK CHECK CARRIED OUT.