I consider a sensor clean on an OMD floating sensor trivial. I've run a wet clean on my EM5 three times since I bought it in 2012. I'd be cleaning it myself, but since you're sending the camera back anyway, have it done. The techs will also do their full check up. I tossed my work sheet from my last reoair, but I believe they check shutter speeds, etc, and you will get the latest firmware update.Generally, I'd be delighted to use these exact copies if restored to full working order and with a fully cleaned sensor. However, I'd prefer to not start from a bad point with both items if the servicing is likely to only lead to partial fixes and/or increase the risk of future issues. Is it possible to clean a fingerprint from a sensor without any negative repercussions to long term image quality? Any thoughts about what y'all would do?
As for the 75mm, when will we ever see it it for $470 again. Answer - Black Friday 2016!. I'd get that fixed too.