Re: Source
The Guardian reports, citing Iranian media:
An Iranian news website said the plane had recently rejoined the air fleet after seven years of undergoing repairs. “The plane which crashed today faced technical problems midair during a recent flight a few weeks ago,” Roozarooz news reported.
An Instagram post from Aseman Airlines two months ago that announced the plane was back in service after seven years was deleted this morning after the plane crash, Roozarooz reported.
Also, see the tweet by Iranian Aerospace Talk Forum I cited above. This could be sourced from the allegedly deleted instagram post.