"...is the section of wiring that connects to the base of the bulb replaceable?"
After checking bulbs and fuses (look on the underside of fuse box lid for headlamp fuse numbers), the H7 bulb socket and bare / exposed wiring would be suspect.
ipdusa offers a H7 bulb socket with pigtail that can be spliced into the harness wiring where the insulation deterioration stops. ipd part number 120485.
If a more thorough repair is necessary, an entire new headlamp wiring harness may be required. Volvo part number 9438738.
Fuses will blow if bare wire on headlamp leads is making contact.
Address these items first, before suspecting relays or switches.
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