Apparently the bearings went on the first motor. The pump is fine but the motor is what is the problem. He replaced the seal and the motor.
Being that 240 v is what is available it seems like 208 would be more than 10% that is why I am question how the motor can run on both voltages. Is there some electronics in the motor now that reads the voltage and makes the change?
If he could have found someone to replace the bearings he likely could have got another five years out of the original motor. It was a mechanical problem that caused the motor to fail, not an electrical one. The pump seal can start to leak a little bit and just the chlorine environment is enough to age the bearings. 208V, 251V, 230V, 240V, 209V, 222V, 233V, wouldn't have mattered.
The motor can run on both voltages because the windings, insulation, fan, etc are configured in such away to make it work, there is no electronics. It's kind of like your car being able to run when it is a quart and half low on oil. The tolerance is built in from the factory.