Finally, I would strongly recommend that steps are taken to remedy matters and feel we are justified in requesting partial compensation.

justified 是动词 justify 的过去分词形式，在句中表示被动。justify 由词根 just（公正的）和后缀 -ify（使...化）组成，意思是"证明...是正当的"或"为...辩护"。justified 在这里表示"有正当理由的"或"合理的"。