B727 PIC MISLABELS THE MEL ITEM AND FINDS THAT THE NEXT DAY THE ACFT IS NOT LEGAL FOR DEP WITH MEL READING THAT HE SIGNED.

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FLT PLAN CONTAINED AN MEL ITEM TITLED 'GND-COCKPIT/COCKPIT-GND INTERPHONE INOP' MEL. UPON ARR AT THE ACFT; THE GND CREW INFORMED ME THAT THE INTERPHONE DID NOT WORK. I TESTED THE INTERPHONE AND FOUND THAT THE COCKPIT-GND WORKED; BUT GND-COCKPIT DID NOT. WE BRIEFED A HAND SIGNAL DEP. I GLANCED THROUGH MY MEL AND FOUND THE SUBSECTION FOR THE NOTED DISCREPANCY; AND CONFIRMED THAT IT WAS GOOD TO GO. SO OFF WE WENT. THE ACFT OVERNIGHTED WITH US AND UPON INSPECTION OF THE FLT PLAN FOR OUR RETURN TO MIA; I FOUND THE SAME MEL ITEM; BUT THE DESCRIPTION WAS CHANGED AND READ 'COCKPIT-CABIN/CABIN-COCKPIT/CABIN-CABIN INTERPHONE INOP.' I KNEW THAT SOMEONE HAD SCREWED UP; BECAUSE THE DISCREPANCY WAS PROPER THE DAY BEFORE; AND I HAD CHKED IT THE DAY BEFORE AND THERE WAS NOTHING WRONG WITH THE COCKPIT-CABIN PA SYS. WHEN I LOOKED AT THE MEL IN ORDER TO STRAIGHTEN OUT THE OFFENDING PARTY; I FOUND IT WAS ME; BECAUSE THE MEL WAS THE RIGHT NUMBER FOR THE COCKPIT-CABIN INTERPHONE AND I HAD NOT CAUGHT THAT MISTAKE THE DAY BEFORE. THE MEL NUMBER SHOULD HAVE BEEN A DIFFERENT NUMBER AND I HAD MISSED THAT. I TALKED WITH DISPATCH AND TECHNICIAN; DID A PEN/INK CHANGE TO THE FLT PLAN NOTING THE PROPER DISCREPANCY AND MEL NUMBER AND MAINT CORRECTED THE LOGBOOK SHEET AND PLACARD. THE TYPICAL RUSH JOB WAS UNDERWAY TRYING TO GET OUT ON TIME; AND I THINK THE BIG FACTOR IN MY SLOPPY RESEARCH WAS THAT I HAD ALREADY CONFIRMED THE PROB TO BE THAT WHICH THE WORDING ON THE FLT PLAN HAD INDICATED; SO I LOST INTEREST IN THE MEL NUMBER WHEN I SAW THE CORRESPONDING MEL SUBPARAGRAPH. I FEEL GOOD THAT WE TOOK OFF WITHOUT AN EQUIP PROB; BAD THAT THE LOGBOOK AND PAPERWORK WERE NOT COMPLETELY ACCURATE AS TO THE PROPER MEL FOR THE SIT.