If this is a naturally aspirated car, then PCV failure usually causes vacuum in the crankcase. NA cars have a different PCV system design than turbo cars. The splatter on the valve cover looks like positive pressure, but as noted positive pressure would not normally result in lots of dirt getting in...

There's no LIN on that board specifically. The board is purely passive switches. Seat switches behave identically to the prior board. Memory switches either pull up to 12V or (more likely) pull down to ground. Based on the diagnostic technique discussed in prior posts, can you take a stab at tracing...

The spindle has a 60deg taper machined into the bottom, which aligns the outer tie-rod end. I.e. these can only be installed one way, you can't flip them side for side and upside down - won't fit. The nut is single use because it's a prevailing torque type. It is a high quality forged nut which is c...