R170 indicator light

My slk has a blown bulb on the wing mirror indicator cluster. Is there a special knack to taking the lens cover off or do I use brute force and ignorance?

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They are LED's..... not repairable. You need a new light unit.
#100 here: http://www.detali.ru/cat/oem_mb2.asp?TP=1&F 0465&M2%2E947&GAr2%2E618&GMq6%2E660716%2E667&CT=F&catfE&SIDr&SGR0&SGN

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