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PL24 serves a stripped NOT_LOGGED_IN_DEMO page (no groups/parts) when the service token is stale. decodeVinForService retries on this, but drill paths (fetchSubGroupsByPath/fetchPartsByPath) reach upstream only via fetchP4Page, which didn't — so Volvo subgroup drilling parsed empty demo pages. Retry once with fresh auth on a demo page. Adds a Volvo-drill diagnostic log. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>