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Hi @calumryan,
503 errors are normally related to errors on an application being served or a configuration error. It should be on Apache’s error log. I would assume it just gets lost in it and that’s why you can’t find it.
What I’ll recommend is using something like swatchdog This should monitor the logs for you.
To fix the problem most probably you’ll need to tweak Apache however first you’ll need to pinpoint the exact error in your log. Except the above, I can’t provide you with any solution as we don’t know the exact cause of the error.
As soon as you have an error, we can act on it further.
Regards, KDSys