Good day I have an mp2510 which started with a 546 code I believe at first which I was able to clear after doing some online research. I had to attempt to fix the problem myself because the only ricoh technician on the island where I lives discontinued support for ricoh in October of 2016. Anyway following online information I ordered some thermistors and changes them. By this time I had done to SC reset procedure 2 or three times in orded ro use the machine. At some point the code became SC 542 which won't clear. I also ordered and have on hand a fuser rebuild kit. Any suggestions? I desperately need this machine to work as I have a project due on the 24th.