Interesting:
(personal translation)
For the item "LG unsafe indication", there is a noticable difference to the checklist of the manufacturer. The manufacturer's checklist contains, as last madatory item, "FUEL CONSUMPTION (FCOM 2.18.40) .... DETERMINE. This item misses completely in the operator's manual.
end quote.
A non-secured screw on the right MLG (actuator cylinder) went loose. Thus said cylinder had an increased "work length" and prevented full retraction of landing gear.
If anyone needs some translation of specific parts, I'll try to help out.
SailorOrion