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model EC25N2 serial# ATB3051193 my question is about the fault codes 49,74 can 1 trigger the other and how likely would it be that steering motor is faulty and how to check as I have no schematics on wiring diagrams

Neither of those codes should trigger the other. It could be that one of the codes is old in history and nothing to worry about. What i would do is clear them, run the truck to try to get one of them to return, then concentrate that one.

Although i have had a few with bad steer motor cause the 49, the code 74 is much more common. See this link if you have not done so already...
caterpillar-electric-forklifts-f10/faul ... isplay-t80