What was found
AFTER TAKEOFF THE CREW HAD RECEIVED A STEERING INOP CAUTION MSG, ONCE CLIMBED TO FL080 THEY REFERRED TO TO THE QRH. AFTER PROCEDURES THE ISSUES DID NOT DISSOLVE. THEY THEN CONTACTED ATC SAYING THEY WILL NEED VECTORS BACK INTO KCLT FOR MX ISSUE. ATC DECLARED EMERGENCY FOR THEM INTO KCLT. LANDED SAFELY NO ISSUES, NO MORE INFORMATION AT THIS TIME. DEPARTING CLT GOT NWS INOP CAUTION, QRH DID NOT RESOLVE ISSUE. RTG CLT / REMOVED STEERING MANIFOLD FROM STEP 4-15 AND REPLACED IT IAW CRJ 900 AMM 32-51-50-000/400-801. LEAK TEST AND OPS CHECK GOOD