Issue 2 could be the ECU is dead but more likely is the door lock actuators are dead and need to be replaced. After 22 years of use they fail. I had one fail in my 5 year old VW Jetta. They get constant use and its an aggressive action.
I had to replace the door lock actuators in both doors on my 97 when i bought it. Have a look through my post history in the DIY section i posted a while ago about using a VW door actuator. Its the exact same part just without the Porsche part tax.
I would make that priority one as theres no point in fixing the steering, CEL, soft top if it gets stolen because you can't lock it.
I bought a new lead acid battery from Porsche 6 months ago and haven't had any issues with phantom battery drain but YMMV.
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