diff --git a/hardware/re-bba-rb/TODO.md b/hardware/re-bba-rb/TODO.md
index 82c9c59..18d84cb 100644
--- a/hardware/re-bba-rb/TODO.md
+++ b/hardware/re-bba-rb/TODO.md
@@ -249,6 +249,20 @@ schematic changes.
       OVLO divider off 12V_RAW, R_top ≈ 1.1 M / R_bottom ≈ 100 k → trip ~15 V.
       See REVIEW.md eFuse entry. Bench workaround: feed 12 V onto 12V_EXI (C65+ /
       U3 VIN) to bypass it. This must be fixed before any V2.1 fab order.
+- [ ] **D9 "USB" LED dark — OPEN SOLDER JOINT on its anode pad (found at
+      bring-up 2026-09-30). Assembly defect on this unit, NOT a design bug.**
+      Symptom: D9 never lights, on USB-only or GC power. Measured 3V3 on the
+      anode-side pad and 0 V on the cathode with the LED dark — i.e. the full
+      rail standing across it, so no current and no drop across R42 (if D9 were
+      conducting the anode would sit at Vf ≈ 2 V). Touching the anode pad with a
+      meter probe makes it light at full brightness: the probe pressure closes
+      the joint. So Q2 (S8550 PNP) and R42 are fine and the LED itself is fine —
+      the terminal is sitting on the pad without wetting it. **Fix: flux +
+      reflow D9's anode pad** (and R42's pad on the same net, `Net-(D9-A)`,
+      while the iron is there). Cosmetic indicator only; does not affect the
+      power mux, which is working (GC/USB handover verified via D8 + rails).
+      Footprint is not suspect — D6/D8/D12 are the same reverse-mount part
+      (Everlight 24-21, C2980185) and all three light correctly.
 - [ ] **12 V inrush limiter (U13 TPS25961 eFuse) — SCHEMATIC DONE 2026-07-31**,
       full design rationale in REVIEW.md §6. J3.5 → 12V_RAW → U13 → 12V_EXI;
       D3 (TVS) stays upstream, C65 downstream. R45 100 k sets I_LIM ≈ 500 mA