| Preliminary inspections and tests |
| Arresting oil leakage |
| Oil filtration and Top up |
| Repair or replacement of defective or obsolete parts including bushings, small and main components, and accessories |
| On Load and OffLoad Tap Changers (OFTC & OLTC) connection, inspection, repair or replacement |
| Major repair or replacement of active parts |
| Treatment of corroded parts |
| Replacement of gaskets |