Are you sure that it was CAS and not CMN?
CAS has been closed and not in use for a while.
IATA-Code: CAS
ICAO-Code: GMMC
Location: Casablanca
Airport: Casablanca-Anfa
Country: Morocco
IATA-Code: CMN
ICAO-Code: GMMN
Location: Casablanca
Airport: Casablanca-Mohammed V
Country: Morocco
Also, it is actually the VOR DME Rwy17R the one with a "Final approach track (166) offset 2 degrees from rwy centerline (168)".