Nintendo dosen't care about its customers anymore. You're probably best off just patching your sm and reinstalling your wiiware/vc games from someplace other than the wii shop channel...
Actually, Nintendo doesn't care about this because your Wii SHOULDN'T have a different Serial in the first place.
The guy probably flashed a NAND he downloaded somewhere, on the OP's Wii, and he now has that Serial.
QUOTE(mauifrog @ Nov 19 2010, 02:49 AM) Do you have a bootmii nand.bin from before you had your wii fixed? You can extract the nand bin and extract your original setting.txt, then replace that back on to your fixed wii. Then use showmiiwads to pack all of your channels you have installed on your nand backup and reinstall them onto your wii.