Final solution, I sent both drive boards to my local forklift repair company who sent them on to Flight Systems Industrial Products for inspection/repair. The repaired drive boards were returned and one was installed to solve the problem.

The Drive board must have simultaneously failed the drive and hydraulic circuits.
The Drive board I purchased from eBay must have had a bad hydraulic circuit and a good drive circuit.
The Drive boards were repaired for $590 and now the forklift works.
Thank you Swoop223 for your help.