steinway action rails

[A440A@AOL.COM]

<<  the rail tubing has some cracks in them. What
is the long term problems if any to develop from this?  >>

Greetings,  
    This is the long term problem!  The action will not be as rigid as with 
new, solid rails, and your regulation will usually be irregular.  I have had 
many rails replaced and it makes a difference. You may perhaps skip the 
let-off rail, since it doesn't receive the same loading as the other two, but 
cracked ones need to be replaced. 
Regards, 
Ed Foote