EMB135 FLT CREW HAS IMPROPER EICAS INDICATION REGARDING AN OPEN CARGO DOOR.

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DURING THE FIRST FLT OF THE DAY PREFLT CHKS; THE CARGO DOOR WAS OPEN; BUT BOTH THE EXTERNAL AND INTERIOR LIGHTS WERE NOT ILLUMINATED. THIS DISCREPANCY WAS BROUGHT TO THE ATTN OF THE CAPT. HE ALSO NOTED THAT THERE WAS NO INDICATION ON THE EICAS OR THE MFD'S TKOF PAGE; WHICH INDICATED THAT THE CARGO DOOR WAS IN AN UNSAFE (OPEN) CONDITION. THE CAPT ENTERED THE DISCREPANCY IN THE AML; AND CALLED MAINT. WHEN MAINT ARRIVED; I WITNESSED HIM INSPECT A MICRO SWITCH ON THE SIDEWALL OF THE CARGO DOORWAY. HE FOUND A PIECE OF BLACK PLASTIC ABOUT 2 INCHES LONG; JAMMED INTO THE MICRO SWITCH. WHEN THIS WAS REMOVED; THE LIGHTS CAME ON AND WE SAW A RAMPER SLEEPING IN THE CARGO COMPARTMENT. THE LIGHT COMING ON STARTLED THE RAMPER; AND I ASKED HIM IF THIS WAS HIS PIECE OF PLASTIC. HE REPLIED 'YES!' I ASKED FURTHER IF HE PUT IT IN THE SWITCH; HE AGAIN REPLIED; 'YES!' I THEN ASKED HIM TO SEE HIS IDENT; AND TO SPEAK TO HIS SUPVR. HE WANDERED AIMLESSLY TOWARDS THE TERMINAL; AND I FINALLY WENT IN AN OFFICE AND HE FOLLOWED. I ASKED A WOMAN BEHIND THE DESK IF SHE KNEW WHO THIS PERSON WAS. SHE RESPONDED; 'YES.' MR X; WHILE ON DUTY; USED A PIECE OF PLASTIC TO DISABLE A SAFETY DEVICE ON THE ACFT; RENDERING THE SYS DEACTIVATED; AND DISPLAYING FALSE INFO TO THE FLT DECK; SO THAT HE COULD SLEEP.