A B737-300 WITH PAX RPT OF R WING FUEL LEAK WAS INSPECTED BY A LCL MECH AND REMOVED FROM SVC AFTER DISCOVERING A DRY BAY LEAK.

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ON DSCNT INTO BNA WE WERE ADVISED BY OUR COMPANY THAT WE WOULD HAVE AN UNSCHEDULED ACFT CHANGE IN BNA. WHEN WE ARRIVED AT OUR NEW ACFT; THE CAPT I WAS TRADING ACFT WITH ADVISED ME THAT THE AUTOPLT WAS INOP. HE ALSO TOLD ME THAT A PAX HAD OBSERVED FLUID COMING FROM THE R WING. HE SAID HE HAD CALLED CONTRACT MAINT TO INSPECT THE WING. THE OTHER CAPT THEN WENT DOWN TO THE RAMP. A FEW MINS LATER HE RETURNED TO THE COCKPIT. HE SAID THE MAINT PERSON WAS STILL OUT ON THE WING UNFASTENING A PANEL. THE CAPT THEN WROTE A DISCREPANCY IN THE ACFT LOGBOOK DESCRIBING WHAT THE PAX HAD SEEN; THEN DEPARTED TO THE ACFT THAT WE HAD LEFT AT ANOTHER GATE. APPROX 10 MINS LATER; THE MECH CAME TO THE COCKPIT AND INFORMED ME THAT THERE WAS FUEL IN A DRY BAY AREA ON THE R WING. I CALLED OUR COMPANY MAINT CTL OFFICE AND HAD THE MECH EXPLAIN WHAT HE HAD FOUND. AFTER HE HAD FINISHED; OUR MAINT OFFICE INFORMED ME THAT THE ACFT WAS OTS. I DO NOT RECALL IF I HAD SIGNED THE FLT RELEASE. I THEN ANNOUNCED TO OUR PAX THAT WE WERE TAKING THE ACFT OTS AND TO COLLECT THEIR BELONGINGS AND DEPLANE TO THE GATE AREA.