RMSS perspective but I think the spells are basically the same. I'll give wording so you can compare.
Attunement: if successful, the player learns one of the powers and is capable of using it. Attunement is easier if you already know what the item does, etc.
Detect Power: just a yes/no answer. Is it magical?
Detect [Realm]: I would only have this detect something if the item is active. If it has the capability to cast a spell but is not doing so currently, it finds nothing. "Detects any active spell or item".
Light Lore: "Caster can ascertain the origin point and nature of any 1 'holy item' that is not 'of darkness' or 'of evil'; will not give specific capabilities." So, this will not reveal the powers but I would have it reveal the religion the item is tied to and give a general sense of where it came from (e.g. "a temple of ___ probably in a desert region"). If the character is familiar with the faith or region (if in doubt, lore check), they could identify the specific temple/location.
Detect Spell: "As Detect Mentalism, except detects any spells that have ever been cast in the area examined. The caster will know the spell type and the list it was cast from." I would say that detects what spells the item has been used to cast (alternately, what spells were used to create it, but I would be unlikely to go that way). I would give a general idea of the function of the spell if it was unfamiliar, and likewise the function of the spell list (but not details of what other spells are on the list etc).
Item Analysis: "Gives a complete rundown on an item's construction, powers, and purpose (may be modified if an item is extremely powerful)." In general I would say yes, it will reveal the powers even of a hitherto-unknown spell. Except it will be vague for sufficiently powerful artifacts.
Force Analysis: I'd treat this as the demon attempting to attune the item, so if successful it would know the details of the powers (at least some of them) but not necessarily the origins or other background of the item. There might be a danger if the item's power gives the demon the power to escape its bindings/control.....