I accessed it via the Haynes manual and google.
Have a look at the link below as this tells you exactly how to replace them, assuming that is the issue in question... normally when they fail the heater works at just one speed, but certainly couldn't rule this out:
How to..
I bought two new resistors of ebay with the nuts and bolts and heat paste in a repair pack for about £12 or something like that.
Something like this is a straight swap and easier than repairing your own resistor pack:
Replacement
Have a look at the link below as this tells you exactly how to replace them, assuming that is the issue in question... normally when they fail the heater works at just one speed, but certainly couldn't rule this out:
How to..
I bought two new resistors of ebay with the nuts and bolts and heat paste in a repair pack for about £12 or something like that.
Something like this is a straight swap and easier than repairing your own resistor pack:
Replacement