FWIW, Hamilton Bowen wrote in his Gunsmithing column in a recent (Dec.2011) issue of "Guns" magazine that he personally considers a fellow named Grant Cunningham to be the go-to guy where old Colt DAs are concerned.
High praise indeed, IMHO, considering that Mr. Bowen is widely considered to be one of the all-time great pistolsmiths.
Being the true gentleman that he is, I'm sure Mr. Bowen would provide you with contact info should you happen to be seriously enough commited to restoring your heirloom revolver to full working condition again.
One caveat: Highly skilled and specialized labor of this caliber never comes cheaply.
Hope this is of some help to you.
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