If you are going to take the unit face plate off anyway to replace the meter, switch the right and left meters and see if the problem goes away r reverses. If switching the L & R meters does not correct the problem, then there is a drive circuit for the meter that may have an issue. I am not that familiar with the later model Mc's (they are very reliable and seldom require service) but I know on the earlier models (up to 2255's) there was a problem with the meter display switch which could also cause this problem. I would have to look at the schematic for this model. Be very careful when taking off the face plate so as not to damage the fluorescent display which has a ribbon connector and is very fragile.