G&L truss rod issue
 

I have an '87 G&L L2000 that I bought a few years ago. I have had to tighten the truss rod several times - always tighten, never loosen. Then I just noticed a slight bulge and crack on the fingerboard between the nut and first fret. I immediately loosened the strings and truss rod. I am assuming that the wood around the truss rod has become compressed, causing the relief to get bigger, so I tighten it then it compresses more, and repeat until it cracked the fingerboard. I have always been careful not to over tighten it.

You can kind of see it here between the A and D strings:





Is there anything that can be done to fix this (by a professional I mean, not by me)? It is such a great bass.

Yes, professionals have fixed such things. I have seen repairs of this type on various sites. Find a good luthier.

To all the kids out there: let this be a lesson, if you turn your truss rod in only the same direction all the time, something is wrong. ;)