[Richard]

Whoa ! Horses, not zebras.

When you are trying to raise the coach what does your supply gauge read?
Is the light green on your HWH control panel?

Before you tear into the front six pack, let’s do some diagnostics. It is HIGHLY unlikely that you have a solenoid problem require it rebuild. Here is why. When in travel mode the air line out of the height control valve tees into the two front travel solenoids. The probability of both of them sticking at the same time is dang near zero.

First thing I would try is to crank the engine, use the emergency off button on the HWH pad, then press the travel button. My HWH panel goes goofy every once in a while and stays in level mode and travel mode simultaneously. The procedure above will wake up the HWH panel.

If that doesn’t work, then put the coach in travel mode, and with the key ON, use a steel washer to see if the front travel solenoids are magnetized. They will be the two closest to the wall the six pack is bolted onto. Check the rear solenoids also. Please report if they are magnetized or not magnetized.
Be aware that all four travel solenoids get their 12V signal from the same terminal. If one is energized, all four should be energized.
As Bill said, stick something under the skid bar to keep the coach from potentially ruining your day.