Root Cause
Evidence trails
Every hypothesis links to the underlying lots, specs, control charts, and matched serials that supported it.
| Trail | Investigation | Hypothesis | Type | Reference | Pieces |
|---|---|---|---|---|---|
| EV-9021 | INV-2049 | H1 · 87% | Supplier lot | BRG-W32..W38 | 14 |
| EV-9022 | INV-2049 | H1 · 87% | Spec drawing | AWX-BRG-24.00 | 3 |
| EV-9023 | INV-2049 | H1 · 87% | SPC chart | CHN-L2-INR-RACE | 40 |
| EV-9024 | INV-2049 | H1 · 87% | Matched serials | 42,800 units | 42,800 |
| EV-9028 | INV-2050 | H1 · 63% | PPAP record | CMP-Q2-14..21 | 8 |
| EV-9031 | INV-2051 | H1 · 79% | Municipal data | Water hardness by region (India) | 7 |