Dear Carlos,
A local (or more sort of) Bosch service is certainly an advantage...
There is a company in Massamá, Lisbon specialized in Bosch Fuel Injection Pumps.
I have seen many "old" Bosch Pumps there and they seem to do a great job.
If you want to, I can give the contacts.
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... however, make sure first that they are trained with our Bosch petrol fuel injection pumps as well.
Many of those official Bosch sites are very familiar with the old-style Diesel pumps that do look very similar as our FI pumps - but they aren't ! A service being able to repair the Diesel pumps does not necessarily do a good job on our FI pumps. So, make sure for good references you can talk to in beforehand.
Especially really make sure you went to all of the "Linkage Tour" first presented here on our site. This is absolutely mandatory first! Most, if not even 95% of all problems are made by the periphery of the fuel injection system and not the FI pump!
Good luck & keep us updated !
Achim