TC/Slip permanently on.

So a while back my 2013 aqua was stolen and driven 100 meters down the road and ditched. It was the classic break the 1/4 glass window, rip out the plastic shroud covering the ignition, smash ignition barrel and start the car with a screw driver. After recovering my car it had the following issues.

1. No ignition barrel
2. Headlights & indicators not working
3. TC/Slip light on (the light that comes on when surface is slippery)
4. Cosmetic damage (windows etc.)

When I got my car home in the following week I replaced the ignition (terribly expensive to get one here in New Zealand I'll add), replaced the 1/4 glass with plexi from work, got a replacement connector for under the steering wheel from pick-a-part and rewired it in place of the old one, which fixed the headlights and indicators (mostly)...but I still have the issue with the slip light being on.

I tried doing a zero point calibration...didn't really know what I was doing and just ended up turning on almost all the warning lights (ABS etc), so I took my car to a mechanic who used their fancy machine which cleared the other lights but left, the slip light on still...they said it was the clock spring so went ahead and replaced the clock spring and did an alignment and calibration but no joy... In the end he gave up and said it's probably the ECU.

I should mention this mechanic is possibly not the best and is certainly no auto-electrician, he got his "electrician friend" to look at it and it was him who decided it was likely the ECU. Any advice how I can troubleshoot the problem and identify what the cause is before I go and throw way too much money at an ECU.

I'll also mention, that sometimes if the connector which I replaced/soldered is moved a bit, or the indicator stalk is moved around the steering wheel (I haven't replaced the plastic shroud...too expensive, don't care about cosmetics atm but this allows movement of the indicator stalks) the right indicator won't work and I'll need to move it around until its sitting in the right spot. Not sure if this is linked to the slip light at all.

Also is the position angle sensor the same as the clock spring??? I can't seem to find a straight forward answer that explains what the position angle sensor is if not the clock spring (in the steering wheel). An auto-sparky said the issue is position angle sensor...the mechanic that replaced the clock spring said its the same thing as clock spring just different name

I can add pictures if needed. Thanks in advance for any help!