2002 S40 door wiring repair

[kmesse]

Intermittent door lock/unlock issues, temperature display not reading right (dashes), occasionally the car alarm would go off. Everywhere I searched pointed to frayed wires in the drivers door wiring loom. So I got the door off, but apart from a couple insulation splits on one wire, all the wires from the harness at the door are all fine going to the connector.
What else should I check? How do I check the connector itself, or should I use a connector grease?