87 5kcstq ABS Problem- Help!

[Larry Mittell <lmittel@ibm.net>]

Some time ago, I posted a message describing an ABS problem with my 87 
5kcstq . Specifically, the ABS warning light illuminates continuously. 
Resetting things via a double-press of the ABS switch puts things right for 
a minute at most. Q-List wisdom was faulty sensor, incorrect sensor 
spacing, or failed ABS relay. None of these appear to be the problem. I 
finally took my kemp to the local dealer to get a reading via the infamous 
diagnostic box. Result: a bad ABS pump is indicated. Unfortunately, the 
price of a replacement has nearly as many digits as my Social Security 
number and the only four new pumps in the world appear to be in Germany. 
Moreover, I can't find anybody who can remember one ever going bad.

Whataya think, guys? Should I start casting about for a used pump? What 
about the computer? It at least has the virtue of being easy to try, 
assuming a used one can be found at a reasonable price. I throw myself upon 
the List's mercy. Help!

TIA,
Larry Mittell