Root canal & crown redo

I had a root canal done for a cracked molar 6 months ago buy an endodontist who was referred by my general dentist.    Ever since, I have had a mild aching in the tooth which seems to be gradually getting worse.    The endodontist took a new film and said he could not see any problem but would re do the root canal, basically, for no cost.    The problem is that a new crown is not covered by insurance, so I am looking at $1300 for a new crown if the root canal is redone.  
Is a  root canal redo likely to fix the pain problem?
Should my general dentist who placed the crown ( and knew at the time that I was still having some pain)  share some of the cost of a new crown?

[lynn117]

i had a root canal and they drilled thru the top of the crown, did the rc, and put a filling in it. its not as pretty but its not a tooth that shows so who cares.  so why must you have a new crown?

[Jordy]

lynn117, a new crown is preferable because having the crown drilled alters the strength, even after it's filled.

Merlina, my own dentist replaced a few crowns that I ended up needing root canals under, free of charge.  But he told me that not all dentists do that.  You'd have to speak with your dentist about that; he may or may not agree with the retreatment; if he does, he may replace it for free or a discount but that is the dentist's choice.  Basically, they fall back on the "you can't predict what a tooth will do" excuse, which is somewhat true.  Sometimes, a root canal fails, even if it's done properly.