left rear turn signal is not working and right rear turn signal is intermittent on 2006 Chevrolet Aveo

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lamps are hard to get to, sofar I have removed the 2 retaining screws, but, the rear lamp assembly refuses to come off
(2) Answers
turn signal switch arm needs to be replaced. Take it to a dealer and they will replace will cost you about $200-$400 or so. in the meantime, use bike signals until you can get it to a dealer.
The assembly is held in place by a post into a snap clip at the top of lens assembly. Pull straight back quickly to release. Check for voltage and ground at the connector for the bulbs, if present, and bulbs are good, check for loss of tension with electrical contacts in the socket.