Power Beyond (boost)(bleed)

[Zebrafive]

On eBay there are two Power Beyond spacer/blocks. One is marked "boost" the other "bleed" both are said to work on my tractor. What does boost and bleed mean? Ebay item numbers are 220766176258 & 32068251646. John Deere numbers are BW15378 & BW15379

I know what Power Beyond is, but not boost or bleed.

 

[Zebrafive]

I guess no one else knows the difference either
Hate to bother the service manager at the local JD dealer. Hoping someone here would know.

 

[kennyd]

I am clueless...

 

[Zebrafive]

In my research I found one reference to the Bw15379 Power Beyond Spacer (bleed).

It was part of BWA1364 & BWA1371 2 function or 3 function joystick/mid mounted ICV Field installation kit.

Since I have the Joystick and Mid mount ICV on my tractor. I assume I have this Power Beyond Spacer with Bleed.

I could not find anything for the Boost Power Beyond Spacer.

Since I doubt I'll ever need a spare I did not bid on either ebay auction, but was tempted to see what I would get.