McIntosh Tuner Alignment

I have a McIntosh MR-71 tube tuner that I dearly love, but at the low end of the dial the channel selectivity stinks. I am presuming it is in need of an alignment since it hasn't been done in the ten plus years I've owned it. I checked into getting it aligned locally (Detroit area) and they estimate $100, but I was told by someone else not to trust these guys. I could attempt to do it myself (I have some test equipment) but have not done an alignment before and don't have the written procedure so I think I'll do more harm than good, though, if someone has the procedure I'd be very interested in seeing it. My other option is to go the distance and have Audio Classics do the Modaferri mod to it to the tune of about $500, but that involves shipping which I'm not real keen on. Also not sure if the improvements are worth $500. Comments and/or suggestions would be greatly appreciated.