Wiper not working on highest setting
 

Have just inherited a 2008 1.6 petrol "Sakata" model and in hoping to get it through the Irish car test (the NCT)
The wipers function normally except on the highest setting.
I'm guessing it's the relay and i'm not shy about taking a crack at replacing it, soldering and all as it's built into the PCB.
Wipers are listed as R25 and R26 on the fuse diagram but the location isn't specified.
I'm guessing that it's the paired relay EX2-2U1S, circled in the photo, can someone confirm this for me?
Or am I getting totally out of my depth and just jumping to conclusions with it?
And advice appreciated, Thanks
https://cimg7.ibsrv.net/gimg/www.maz...3356b9a751.jpg