A B737-700 ACFT SUSTAINED LH AND R-HAND LEADING EDGE FLAP DAMAGE DUE TO FLAPS RETRACTED WITH SPOILER LOCKS INSTALLED. FOUND AFTER TAXI TO GATE.

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I WAS WORKING OVERTIME FOR LINE RON. MY JOB ASSIGNMENT FOR THE NIGHT WAS NAV DATA AND LAPTOP DOWNLOAD FOR ACFT ON THE LINE. MR X AND I WERE ASKED IF WE WOULD HELP OUT AND TAXI ACFT Y OVER TO THE WASH RACK BECAUSE OF LACK OF RUN AND TAXI QUALIFIED PERSONNEL. I WAS TOLD AFTER THAT I COULD GO TO LUNCH; BEING THAT I WOULD BE AT THE HANGAR. MECH WAS IN L SEAT AND I WAS R SEAT. AFTER DROPPING OFF ACFT Y; WE WERE ASKED TO TAXI ACFT X BACK FROM THE WASH RACK TO GATE. I EXITED AND I WENT (WALKED) OVER TO THE FRONT OF ACFT WHERE MY LEAD WAS SITTING ON THE TUG. HE WAS DOING HIS WALKAROUND ON ACFT. AFTER HE WAS DONE WITH ACFT; HE CAME OVER TO ACFT X AND PROCEEDED TO DO A WALKAROUND. I WAS ASKED TO GO FIRE UP THE APU AND GET READY TO CONFIGURE. I WAS CLRED FOR HYDS; EAU'S WERE RESET; CLOSED THRUST REVERSERS; OVERHEAD LIGHTS STAYED ON. I ASKED TO OPEN THRUST REVERSERS AGAIN AND RESET EAU'S. AGAIN I ASKED TO CLOSE THRUST REVERSERS AND FLAPS UP; CAME UP THE STAND AND CLOSED THE DOOR. I WAS ALREADY IN THE L SEAT SO HE SAT R SEAT. WE GOT SITUATED; PUSHED GND CALL FOR BRAKES OFF AND STARTED TO PUSH BACK. I REALIZE 'A' SYS WAS STILL ON; REACHED UP TO TURN IT OFF. TOO LATE; WE SHEARED THE TOW BAR BOLT. THE CREW WENT AND GOT ANOTHER BOLT; FINISHED PUSHING US OUT. TAXIED ACFT X TO GATE. WHEN WE GOT TO THE GATE; I DROPPED THE FLAPS AND THAT WHEN WE REALIZED THE FLAPS WERE DAMAGED. AT THE GATE IS WHERE I WAS TOLD THAT THEY (LINE DONE) TAXI WITH FLAPS; 15 DEGS TO AND FROM THE WASH RACK BECAUSE SPOILER LOCKS ARE INSTALLED. I HAD NO IDEA THAT'S WHAT THEY DID AND I HAVE ALWAYS BEEN TOLD TO TAXI FLAPS UP. ACCORDING TO OUR RUN AND TAXI SHEET; WE ARE SUPPOSED TO TAXI FLAPS UP. UPON OUR OWN INVESTIGATION; WE FOUND THAT THE INCORRECT LOCKS WERE INSTALLED ON THE GND SPOILERS. THEY HAD FLT SPOILER LOCKS INSTALLED ON ALL SPOILERS; AND NO DAMAGE WAS DONE TO THE FLT SPOILERS. NEVER WOULD I HAVE THOUGHT THAT FLAPS WOULD BE DAMAGED WITH SPOILER LOCKS ON. WE RAISE FLAPS TO 0 DEGS EVERY DAY ON 'C' CHK WITH SPOILER LOCKS INSTALLED ON OUR -300/-500 ACFT.