01 ml55-few questions-changer,trip computer,wheel bearings

[alx]

hello everybody

i have a few questions regarding 01 ml55 amg

1. the first one is 01+ ml-generic - cd changer tested ok in another truck, but when plugged in the ml55 - doesnt work - fiber appears to be active and working (coming from the mcs harness), but changer appears dead. will not even eject. actually when you press the eject button and the mcs reboots. funny. what is the correct pinout for the 3-pin cd changer connector?

2. overhead console trip computer- doesnt seem to keep date/time/settings after the truck is shutdown.

3. rear wheel bearing- are those servicable? i have one that needs replacement. press-fit or i need the whole hub replaced? havent looked.

thank you in advance

alex