yeah thats wot i thought too,an how could you prove it wasnt you that put it on break?
just sit with the vosa guy having a cup of tea and wait for it switch itself. 
Not really qualified to answer this one as the last Merc I drove was a 1748 Powerliner with EPS. Cool at the time though (Late 80’s must be) 
Looks a good truck, I would much prefer one of those to the crap scania ive got at the moment.
we have 5 of them,mines the only one in our livery,the others are still in 4ja livery which we took over