Hi, thanks for your answers.
I sent it to service here in Montevideo. At first, they indeed told me it was the output's resistor that wasn't working anymore. (A collegue from Montevideo had experienced the same problem with a ew100 G2). They replaced it, and told me it was working again. Once I got home, I checked it an now only intermittent noise was coming out of the receiver's mini jack output. So I took it to service again. Now he's telling me "a false contact from the tape (or flex?) that unites two boards in the circuit has caused the device to not respond correctly, I can’t change it’s digital parameters”. That sounds kind of akward to me (also sorry for the weak translation), and I'm not sure about the relationship between cause/consequence, but anyway: Is there a way to restart or set the G3 to default? Do you guys think that might be the actual cause for this new problem?