P4 overhaul in accordance with the Maintenance System Documentation (DSU)
- Complete vehicle repainting with new reflective striping
- Replacement of roof-mounted equipment vibration isolators with new units
- Replacement of flooring and floor coverings
- Replacement of passenger handrails and grab handles
- Replacement of toilet modules
- Replacement of fresh water and wastewater tanks
- Replacement of toilet doors
- Installation of new 230V AC and 5V DC power outlets at all passenger seats
- Installation of automatic hand sanitizer dispensers
- Creation of dedicated staff areas within passenger compartments
- Installation of battery isolation switches in conductor-operated areas
- Installation of new driver and assistant driver seats
- Replacement of luggage rack inserts
- Replacement of front headlights with LED units
- Provision of portable LARISA 1800 boarding ramps
