What was found
SLAT DISAGREE LIGHT LEVEL 2 ON SHORT FINAL, 36R MEM NO CONTROL ISSUES, ACFT STABLE AND HAD BEEN CONFIGURED FOR LONG TIME ALREADY. PERFORMED GO AROUND, RAN QRH, RECONFIGURED, NO MORE LITES. UNEVENTFULL LANDING. PSEU HAD NO FAULTS STORED AND RTS OK. FCC'S HAD NO FAULTS PERTAINING TO THIS DISCREPANCY. CAPTAIN STATED IN TURN-OVER THAT THE FLAPS/SLATS WERE EXTENDED/CONFIGURED "FOR A LONG TIME ALREADY" AND THAT THE ALERT OCCURED "AT 500 FT". HOWEVER, C/W WITH MM 27-84-00-5, APPLICABLE PROCEDURES. OPS CHECKS NORMAL, NO HISTORY FOR 99 DAYS, OK TO CONTINUE.