Hello antoniorocha,
I don't know exactly what was done by the service technician in addition to replacing 2 parts.
I would suggest that you contact the service team and have them check for additional suggestions. The technicians can call a 2nd level technical help line and there are also special forums set up for them where complex technical issues are discussed.
There is also a way to contact service experts online by clicking the following-- Fast Track to the Expert
Please post status and additional details if you still need assistance.