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Graham. The shims might need repositioning to square off the sensor, and possibly a good clean with some isopropyl alcohol. If the bunnies are deep, you'll have to dig them out and give the sensor and low pass filter, if installed a good alcohol clean as well.
Trying to be helpful, and if you don't have pro cleaning equipment, wash out a good quality microfibre cloth in alcohol and let it dry. Grab a soft plastic square ended (a soft plastic ruler cut to size) blade, the same width as the sensor area and wrap the cloth tight and flat around it just damp with alcohol. Clean in single sweeps use one edge then turn over, rewrap at different points on the cloth to avoid spreading what you have already removed. Use a magnifying glass and good light to inspect the surface from different incidents. Get the low pass filter on asap. Keep the bits in glad bags once clean and remove and fit with pointy nose tweezers.
If that doesn't fix it then I have been of no help at all...
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