What was found
APPROACHING RWY23R KTYS FOR TAKEOFF, INDICATING SMOKE IN COURIER AREA. STOPPED ACFT. CONFIRMED SMOKE IN COURIER AREA. NO SMOKE IN COCKPIT. DECLARED EMERGENCY WITH KTYS TOWER. CONDUCTED EMERG EVAC, EXITING VIA L1 SLIDE. PERCEIVED SMOKE COMING FROM VENTS OVER EACH ENTRY DOOR, L1 & R1. R & R YELLOW RESERVOIR SYS CHECK VALVE. PERFORMED AIR COOLING SYS SERVICING WITH ENGINES RUNNING IAW MM 21-51-00-03. NO EVIDENCE OF HYD ODOR OR FUMES OF ANY KIND IN COCKPIT, COURIER OR CARGO AREA. REMOVED BLANKING PLUG & INSTALLED DUCT IN AVIONICS BAY. INSTALLED CONNECTOR 29HK & PANEL IN E/E BAY. R & R LT & RT COALESCER BAGS WITH NO SIGNS OF OIL OR CONTAMINATES. OPS NORMAL IAW AMM 21-51-16-03.