Problem with 85mm 1.8

[Ezequiel]

Hello!! I have a problem with the lens ??. A while ago I noticed a stain inside. They are not ”fungus”. a trusted technician to see it told me it is a problem of "internal couting". Any idea? The Warranty has expired 

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[tinplater]

Might be time to sell for parts and replace with a new version.

[Chrissie]

23 hours ago, Ezequiel said:

"internal couting"

Google gives no results for "internal couting". The most likely replacement in this context would probably be "internal coating". There are a few suggestions given on how to deal with problems like yours, like this one on stack exchange.com. Warning: not for the faint-at-heart though.