Leandro Trossard has revealed the two key areas he feels Arsenal ‘need work’ before visiting Bayern Munich in the second leg of their Champions League quarter-final tie. The Gunners’ late hero believes Der FCB showed Mikel Arteta that his north London giants must improve if they are to progress. Trossard rescued Arsenal a 2-2 draw in the first leg of their quarter-final tie this Tuesday night. They will go to the Allianz Arena next Wednesday. Mistakes from David Raya, after Ben White spurned his glorious chance to secure a 2-0 lead, allowed Bayern Munich to overturn their early deficit. Bukayo…