Need to suggestions who can repair broken RCA input jack on Classe Audio DR-8

For reasons I do not wish to explain, the RCA pin for my RCA cable broke off inside the RCA jack for my Classe Audio DR-8.  Of course, I damaged the inside of the RCA jack trying to retrieve the broken RCA pin (I got the pin out but must have damaged something inside the jack beyond repair.  Now I need to figure out who I can send the amp to so they can replace the broken RCA jack.  Would like to use OEM parts if possible in order to keep the amp original.  Should I send the unit back to Classe Audio, or is there someone in the USA who can properly repair the amp?  Suggestions would be greatly appreciated.  

Also, someone said the RCA input sounds much better than the XLR input for the DR-8 amps.  Is this true, or just one person's opinion.  Did not know if this was a known fact or just opinion.  

Thank you in advance.