Dave,
See Racecars initial post # 30 > my response in post 31 > Racecars follow up response in post 34. This "and why no alarm?" in post # 37 also differs from the problem typically cited. Everyone who's experienced this issue has stated that manually unlocking the drivers door trips the SKREEM alarm. Also no one else has noted any humming/fan running noise from "under dash".
Tim