Just realised that my mac pro 1,1's front 2 fans are not working. Was using smcfancontrol and checking the readings only to find that the cpu fan and expansion slot fans are at 0rpm. Other fans working as usual. Temps inside seem to be fine with only the northbridge reaching 64deg celsius. Others vary from 37-47degs. Should I take it in for repair or be better off sourcing a replacement?