L-R Pressure switch

[2GDiamondStar]

I look'd around the forums for a bit found some stuff on this but nothing that really tells me how to solve my problem. So i'm just gonna go ahead and start one of my own up.
I scanned my Eclipse with a obd2 diagnostic, and it gave me the code P1784, which is L-R Pressure switch problem, I just don't know what..or how to go about fixing it. Also read some things about the solenoid pack, do i replace the pack if i want to fix the problem? or do i have to check the wiring, I'm clueless on wiring, So my question really is how do i fix this P1784 problem?

Car - 1998 Eclipse RS
Transmission - Automatic

Car heated before and stopped on the road, drove it today around the block for about 45 minutes and it was normal. So i don't understand the whole concept of this problem.

Anyone? D:

 

[Black'95]

Check it: I bought a 1998 mitsubishi eclipse and the check engine light came...

I'm not entirely sure about the location of the switch itself, so try some more Googling, or a shop manual if you have one. Good luck, bro.