What was found
DURING CLIMB OUT FROM KTYS, THE FWD CABIN DOOR ANNUNCIATOR CAME ON PASSING 14,000 FT. SHORTLY AFTER AIRCRAFT BEGIN TO DE-PRESSURIZE WITHOUT PILOT INPUT. PILOT RAN THE ASSOCIATED EMERGENCY CHECKLIST & DECLARED AN EMERGENCY WITH ATC. PILOT DIVERTED BACK TO KTYS & LANDED WITHOUT FURTHER INCIDENT. MX FOUND CABIN DOOR HANDLE MICRO SWITCH BRACKET LOOSE & CABIN DOOR SEAL POPPED OUT OF DOOR C CHANNEL FWD LOWER AREA. MX INSPECTED SEAL & REINSTALLED CABIN DOOR SEAL INTO THE C CHANNEL. ADJUSTED CABIN DOOR HANDLE MICRO SWITCH ACTUATING ARM, PERFORMED GND CABIN LEAK TEST & OPERATIONAL CHECKS. ALL CHECKED WERE NORMAL AT THIS TIME IAW BEECH 1900 AIRCRAFT MM 21-30-00.