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Look like 3W 6.8 ohm (6R8) 5% (J) resistors to me. Measure the lead spacing and you should be able to find suitable replacements at Mouser or DK.
Edit: Not sure about the size, but probably these: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=TWW3J6R8-ND
Though I doubt there's anything wrong with these, they don't look damaged.
I'm a tech and I cant even locate that vender logo best I could come up with is "Astec Semiconductor" but nothing else. Are the numbers 6R8J 88C6-E20? At least we now it some kinda resistor.
ref: http://www.elnec.com/support/ic-logos/manufacturer-description/?manuf=Astec+Semiconductor