Hi folks
Thanks for the info - I did try 11 and 88 (got factory level 88 from trolling here!)
Ta muchly James for the useful list - we have lots of different stuff here on this site.

Reason I need to get into service menu is to change evap pump duty.
It seems like the three chillers are set to run pump A all the time with pump B coming on only if A fails.
The chillers tend to be neglected a bit - not enough people here who are interested in getting things right !
Result is that the B pump sits unused and eventually seizes or becomes tight - or the constants running of evap pump A eventually causes unobserved bearing/seal wear and the pump fails,

I do realise that carriers policy seems to be to be very cautious about allowing access into controllers etc - for good reason. I'm sure we have all been victims of "finger trouble"
Sometimes even caused ny "engineers" !!!