The problem with the T2 vacuum interlock was fixed by restarting the "Crate TG1" control panel microprocessor.  The T1 and T2 vacuum interlocks were retested several times and are functioning properly.  Fault report #5907 was returned.

Graham Waters investigated the faulty signal from T2 expansion tank warning level sensor.  The problem was found to be a loose cable at the panels.  The connection was restored and the level sensors are now displaying correctly.