This article I found while pondering the same question states that it was de-orbited a day after the test firing (http://maikelnai.elcomerciodigital.com/2009/12

This article I found while pondering the same question states that it was de-orbited a day after the test firing (http://maikelnai.elcomerciodigital.com/2009/12/30/salyut-3-disparando-desde-el-espacio/ http://maikelnai.elcomerciodigital.com/2009/12/30/salyut-3-d...), granted it doesn't provide sources for that specific claim.