⌘K
INV-2052

Neff HBG675BS1 · Control board

Random reboot / F42 code

Stage
Closed
Triangulation
82%
Units-at-risk
6,200
Exposure
€480k
Loop age
Day 13
of an investigation that legacy took ~428 days
Origin
Loopback pattern engine
Owner: J. Weber

Ranked Hypotheses

Generated by the agent, holdout-tested, ranked by posterior probability.

Human review & action
Validating routes into Production Response and raises the CAPA in SAP QM. No production action executes autonomously.

Evidence

For H1 · 92% confidence

Statement
Firmware watchdog race condition in v4.2.1 on cold-start with ambient <5°C.
Underlying data
  • Incoming inspection · BRG-W32..W38open →
  • Spec drawing 24.00 ±0.015mmopen →
  • SPC chart · inner-race diameteropen →
  • Matched serials (42,800)open →
Holdout test
Precision0.91
Recall0.86
FPR4.2%

Agent Reasoning Trace

Multi-step reasoning made inspectable. Each step is a real tool call against MES, supplier, PLM, and environmental data. This is the glass box.

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  1. step 1Telemetry.query
    720ms
    Pull F42 fault traces from Home Connect
    Finding
    612 events; correlated with cold-start conditions
    Updates ranking
    Pattern investigated
  2. step 2Firmware.replay
    3400ms
    Replay traces on HIL rig with firmware v4.2.1
    Finding
    Watchdog race reproduced
    Updates ranking
    Firmware hypothesis at 0.92
  3. step 3Design.verify_fix
    2900ms
    Verify v4.2.3 patch resolves race
    Finding
    0 reboots across 10k HIL cycles
    Updates ranking
    Ready for OTA rollout