Source page: MOC-2025-012 - Gearbox Oil Grade Change to PWG 220 · Original file: original.docx · Provenance: ✓ quote verified (native text)
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On 2025-01-21, at -24.6 °C, WTG-02 and WTG-09 needed more than 6 hours of heating before they could start. The bulletin also makes the change a condition of the gearbox warranty.