Hello, On a 2000 outback, auto tranny. Can and how would you check a line pressure solenoid on the workbench, also the 2-4 brake duty solenoid is the same. What does the 2-4 accomplish and what would happen if the two were switched, reason being to see if the one is defective. (Subaru wants about $130 for a solenoid, ouch!) This car is my brothers and after doing the head gaskets in my 99 2.5 he did his and that is when the temp light came on and tranny not shifting right. Input would be appreciated, Thank you kindly.