I was planning to send my MM for a CLA at the nearest Leica service center (HK), I've been seeing these nasty sensor dust spots that can't be removed by the usual bulb blower. When I emailed to the authorized Leica service center (HK), with the attached screenshot below, the reply was;
I think that your sensor problem should be sensor coating problem and that must need to replace a new sensor.
As the sensor from Leica Germany was lack of supplying so all of our customers might take around 6 months for new sensor replacement so that you cannot take it back before <date>.
This replacement will be free of charge as this sensor problem was under Leica goodwill service.
However, you need to collect it back by yourself or the person you authorized after repair as we do not provide delivery service to oversea countries."
I'm not quite convinced on the "sensor coating problem" as stated above. Need your advice on what to do next... I can't imagine having w/o my MM for the next 6 months, but if this is the best way to move forward, then I'll have to do it...