REPAIRMAN WAS WALKING OVER TO HIS TOOL LOCKER INSIDE THE SOUTH MAINT. SHOP PRIOR TO GOING BACK OUT INTO THE PLANT. AT APPROX. 11:10 AM, HE TRIPPED OVER CAKED MATERIAL, DRIED MUD OFF THE SHOP TRUCK, AND FELL FORWARD SUDDENLY INTO THE SW CORNER OVERHEAD DOOR, CAUSING A RT. FOOT INJURY. INITIAL TREATMENT W/ X-RAY WAS NEG. CONTINUED WORKING REG. DUTY UNTIL 12/19/03 THEN RESTRICTED.