Yes!!
Since nobody answered my request
I tried one by one all the NRPNs that are not listed in the documentation on page 84/85.
I started at 151 because there is a hole between 150 and 156.
Nothing...
Then I tried the 159, then the 164 and the 165
bingo !
The 165 activates the Hold ON/OFF with data 1=ON 0=OFF.