The air pump is an easy job. Just make sure you have a 10mm stubby wrench. The craftsman one is fine.

Go to Volvospeed.com ... click on "repairs/maintenance" ... enter bay13's area ...
click on "engine" ... click on "air pump"

The job should take about an hour.
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'87 765Ti - 145K: '88 765Ti - 170K; '98 V70R AWD - 87K

Welcome to the club. I went through two of these already. The first was under warranty. The second was last spring due to failed bearings. Just this past winter it froze up again with only a few drops of water in a bad location. I have now drilled holes in the bottom of the housing to prevent this from happening again. My checkvalve works fine and has been replaced. This is just a poor design and will haunt all of us who have these pumps until the day we sell our cars (and by Subaru WRXs :} ?!

Try removing the pump as per volvospeed info and running it. CEL sets if pump does not run but it may be caused by a freeze up. If the pump still runs, change the valve (SAS) and drill a 1/8 dia hole in the pump for a drain. Also check volvospeed board as there was an interesting discussion about installing an aftermarket pump that goes for $60 and fixes the problem.

Ray-
Not a hard job at all, I completed it in a little over an hour using Volvospeed's guide and photos. The hardest thing for me was getting to the bolts on the flange of the Check Valve. I have huge hands which always make engine compartment repairs interesting! Ended up basically laying across engine to get the right angle to reach the bolts. I did not replace the relay, mine was a bad bearing due to water intrusion.

1,Dykes are diagonal wire cutters shorter than snips.
2, On early models the relay was mounted on the airpump braket .I think in '97 it was moved up (unkown location)
3 Check valve is SAS valve

Dykes are just wire cutters at least where I'm from.

bl