What was found
RUDDER LIMITER CAUTION MESSAGE ILLUMINATED AFTER TAKEOFF, COMPLIED WITH QRH. EMERGENCY DECLARED, RETURNED TO DEPARTURE. COMPLIED WITH INSPECTION OF WATER TRAPS, NO MOISTURE FOUND. COMPLIED WITH SPOST 1 & 2, FAULTS CLEARED. COMPLIED WITH OPS OF SPOILER AND STABILIZER SYS, OPS CHECKED GOOD IAW AMM 27-61-05.