There certainly wasn't when they were still in production and even non genuine body panels weren't available back then. Still don't think there's anything available now except service and suspension items.
You don't fill it manually. It should be kept topped up with transmission oil when the engine is running and the level maintained automatically at all times.
If yours has emptied, you'll lose the brakes and the most common cause is for a small steel pipe that is fitted inside the end of one of...
Don't QTP source a lot of their stuff from OEM dealers anyway...? Just might take a day or three to get it.
The control valve may not be engaging fully due to a weak solenoid or not enough volts reaching it. Have you checked the alternator output is around 14.4v as it sends a signal to the pto control module in the fuse box when the pto knob is turned on?