Where is my steering fluid reservoir?

[Jaime&Patrick]

This is or is not a silly question considering how long we've owned this bus, but does anyone know offhand where the power steering fluid reservoir is on a 2000 Setra S217 HDH?

The mechanism is in the spare tire compartment behind the front bumper, but I'll be danged if I can find where to check the level!

Thanks you guys!

[Dave5Cs]

In the engine compartment at the passenger side near the back corner of the engine. Should be a site glass but maybe not if it is a newer one than mine.