Twelve Years
Is *not* a very long lifespan for a Miele washer, especially of the vintage as yours.
Miele washers of old then and still are designed to give easily 15 to 20 years service with little to nil repairs. Some of us have Miele washers that are far older than 20 years old that still are working fine.
Sadly yes, Miele's call out and repair charges are dear, especially for those that live far from the core New Jersey/New York area, and or other select urban centers where the company has a large enough presence.
Equally sadly unless you are willing to do some research/diagnosing of the situation yourself, and or perhaps even the repair, the only thing for it is to deal with Miele service.
First and foremost there are other sources for Miele spare parts other than dealing with MieleUSA. Call their parts department in Princeton, NJ and after giving your washer model number ask for number to whatever part you think wants replacing. In this case it might be the circuit board. Then taking that number go to eBay and see if there is a match. You might try opening up the search to include "worldwide".
This and or plug the part number into Google and see if it comes up from a supplier in Europe or elsewhere. Unlike in USA where Miele virtually has a lock on spares, elsewhere in the world many appliance spares shops sell OEM Miele parts often for far less than what they cost in USA. This of course will vary by exchange rate and several other factors, but still...
Myself and others have purchased Miele spares from other sources and MieleUSA techs did the installation. Long as the package is sealed and the parts "new", they are covered under same warranty as if Miele supplied.
If you have the space to keep the Miele washer around for a while, I'd not junk it hastily. Especially if it can be repaired and put back into service. While the SQ is a great washer it does not have a heater and the various capabilities of Miele.
There is nothing like putting badly soiled/marked laundry into a Miele; adding a bit of detergent and setting for a "hot" or even "boil" wash. You return later to immaculate laundry without the need for chlorine bleach and many other laundry additives. For doing silks, woolens and other delicates, again you cannot beat a Miele.