I see from your profile you have a 2000-38'
iirc your CAC is the assembled type, i.e. has two gasketed end sections which bolt together to the finned section; the end sections have the tube-connections molded in.
Several Alpiner's have had the gaskets go bad, and some have even found a number of the small machine bolts (might be allen-head type) loose such that tightening them resolved their leak. Have you tried that?
If that doesn't work, check out these Search results for "CAC Replacement": Link1
for more info