GND CREW DISCOVER DAMAGE TO R AILERON ON B737-300. CAUSE UNKNOWN.

Narrative

UPON ACFT ARR IN LBB; I PERFORMED A WALKAROUND. NO DISCREPANCIES WERE NOTED AT THAT TIME. WE THEN FLEW TO ELP. THE FLT WAS NORMAL; AND NO PROBS OR UNUSUAL EVENTS OCCURRED. I WAS THE PLT MONITORING ON THIS LEG. WHEN WE ARRIVED IN ELP; WE PARKED THE ACFT AND PROCEEDED WITH OUR DUTIES FOR TURNING THE ACFT. THE ACFT WAS UNLOADED AND THEN LOADED. IT WAS REFUELED FOR THE TRIP. ABOUT 10 MINS PRIOR TO PUSHBACK; THE CAPT AND I WERE IN OUR SEATS AND ACCOMPLISHING OUR CHKLISTS. 2 OR 3 MINS BEFORE PUSH; THE TUG DRIVER TOLD US WE SHOULD COME OUT AND LOOK AT THE R WING. ANOTHER RAMP AGENT HAD SEEN SOME DAMAGE TO THE R OUTBOARD PART OF THE WING. I WENT AND INSPECTED THE DAMAGE. THERE WAS A 2 INCH GASH IN THE R AILERON ABOUT 4 INCHES LONG. THERE WAS ALSO SIGNS THAT ABOUT A 2 FT WIDE AREA HAD BEEN IMPACTED (SCRAPED) BY SOMETHING. WE MADE ALL THE PROPER CALLS TO HAVE THE ACFT CHKED OUT BY THE STATION PEOPLE IN ELP. THE ACFT WAS DEPLANED AND TAKEN OTS. IT IS MY BELIEF THAT A FUEL TRUCK IN ELP BACKED UNDER THE WING AND DID THE DAMAGE. NO ONE SEEMED TO WITNESS OR KNOW AT WHICH PRECISE TIME THE EVENT OCCURRED. SUPPLEMENTAL INFO FROM ACN 693402: I SUSPECT IT WAS DAMAGED BY A FUEL TRUCK. OPS SUPVR SAID HE INSPECTED FUEL TRUCKS AND FOUND NO DAMAGE.