Do it yourself...
Kelsey/Hayes 325 (1999-2004(5)Tahoe, Silverado, Yukon, etc.)
Locate EBCM unit (Below drivers door just inside frame)
Remove four T-20 torx head screws from top of EBCM.
You will need a small 1/4" ratcheting wrench and a 1/4" shallow socket to use on the T-20 torx bit.
Once the screws are out, use firm upward force to break the soft seal from the pump block.
BE SURE TO LIFT STRAIGHT UP ON THE MODULE UNTIL ALL 6 SOLENOID SHAFTS ARE CLEAR!!!!
Remove the three wire harnesses attached to the EBCM. Once the module has been removed, cover the pump block with plastic and secure with duct tape to keep debris out.