FO RPTR EXPRESSES CONCERNS AS TO WHETHER THE PIC HAD WRITTEN UP AN ACFT EQUIP PROB ON AN MD80 PRIOR TO DEP. MECH WAS CALLED OUT AND PIC HAD DISCUSSION WITH HIM.

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I HAD JUST BEEN CALLED OUT TO OPERATE A PART 121 REVENUE FLT AS A FO. THE CAPT WAS ALREADY ON THE TRIP. I DID THE PREFLT WALKAROUND AND THE 1 DISCREPANCY I FOUND WAS THE GEAR DOWN AND LOCKED INSPECTION LIGHT ON THE L MAIN LNDG GEAR (MD80) WAS INOP. I RPTED IT OVER THE COMPANY MAINT FREQ WHEN I GOT BACK TO THE COCKPIT. I ALSO RPTED IT TO THE CAPT WHEN I SAW HIM. HE SAID 'I'LL TAKE CARE OF IT.' THE MECH THEN CAME OUT AND I SAW THEM TALKING AND THE CAPT HAD THE LOGBOOK IN HIS HAND; BUT I DON'T KNOW IF HE WROTE IT UP IN THE MAINT LOGBOOK FOR OUR ACFT; I WAS BUSY DOING MY COCKPIT SET-UP. THE MECH THEN LEFT AND I ASKED THE CAPT ABOUT IT AND HE SAID IT WAS 'TAKEN CARE OF.' I STILL DON'T KNOW IF HE ACTUALLY WROTE IT UP AND IT WAS SIGNED OFF. I'M CONCERNED BECAUSE I KNOW THE FAA MONITORS OUR MAINT FREQ; AND THEY MAY CHK UP ON THIS IF THE CAPT DIDN'T WRITE IT UP. IT IS THE PIC'S RESPONSIBILITY TO MAKE SURE ALL MAINT DISCREPANCIES ARE PROPERLY WRITTEN UP AND SIGNED OFF; BUT I DON'T WANT THE FAA TO COME AFTER ME.