Source page: 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10) · Original file: original.docx · Provenance: ✓ quote verified (native text)
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Contributing factor: wear of the HSS bearing on the generator side, confirmed by oil analysis TR-OA-2026-0614 (iron 64 ppm, PQ index 112) and by the vibration trend, increased the friction losses in the gearbox.