B737 CREW SPILLED COFFEE ON THE CTR CONSOLE. THE #2 VHF RADIO AND NAV WERE INOP. THE ILS DME WAS NOTAMED UNRELIABLE.

Narrative

WE WERE FLYING INBOUND TO LINDBERG FIELD AT SAN DIEGO USING THE LOC 27 AT THAT FIELD. ENRTE FROM THE EAST COAST AT CRUISE; WE HAD A COFFEE SPILL THAT MADE #2 VOR FREQ UNREADABLE AT THAT TIME. THE PROB WE THOUGHT WAS CORRECTED AS WE NEARED SAN DIEGO AS ONE COULD MAKE OUT THE FREQ AT THAT TIME. HOWEVER; WHEN I SELECTED THE FREQ FOR THE LOC 27 I HAD OFF FLAGS ON MY HSI AND NO DME. THE CAPT'S LOC RECEIVER WAS WORKING NORMAL AND WE WERE GOING TO USE IT TO DETERMINE THE DME FOR THE APCH. I WOULD BE IN LNAV ACCORDING TO COMPANY POLICY. WE WERE ON THE APCH AT 2000 FT MSL INBOUND TO THE FAF AND AT THE APPROPRIATE DME AND STARTED OUR DSCNT TO THE MDA OF 700 FT. AT 1500 FT AND DSNDING; APCH INFORMED US THAT HE HAD A 'LOW ALT WARNING' FOR US AND FOR US TO CLB; WHICH WE DID INITIATING THE MISSED APCH PROC. THE PROB WAS THAT WE WERE NOT AWARE OF THE FACT THAT THE DME FOR THAT APCH WAS UNRELIABLE AND WE MISSED THE INFO FROM ATC INFORMING US THAT IT WAS. THE CAPT WAS USING HIS DME FOR THE APCH. SINCE WE WERE LEFT WITH ONLY 1 VOR/DME WE SHOULD HAVE AS A BACKUP REQUESTED RADAR FIXES FROM APCH TO IDENT THE FIXES FOR THE APCH. THE COFFEE SPILL THAT LEFT THE #2 NAVAID INOP TO THE MISSED INFO ABOUT THE DME BEING INOP LED TO A SIT THAT HAD US LOWER ON THE APCH THAN WE SHOULD HAVE BEEN.