If electrical power fails during a coach fire and the driver's dashboard door switch fails to open pneumatic passenger doors, how should the doors be opened?

1. Operate the Manual Pneumatic Emergency Door Release Valve (车门应急放气阀/手动应急开关) located near the door to release air pressure, then push doors open manually
2. Wait for electrical power to restore itself automatically
3. Use engine oil to lubricate the door seals
4. Instruct passengers to remain seated until firefighters arrive