Got in the thread a little late but here's what I personally see add the difference between the AV rates.
AE - they are mostly O level working on the wiring between the components throughout the whole jet.
AT O level - they troubleshoot and replace faulty electronic components on the jet.
AT I level - this is what I am. We work in freezing cold workshops on the gear that O level pulls out from the jet, repair them, and send them back out. We don't work directly on the planes.
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