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97 GC SE 3.3 cruise control inop, where to start?

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Cruise control stopped working in our '97 GC SE 3.3. The CEL is on showing P0104 or whatever the EGR code is. Cruise has worked with this CEL before. The CRUISE light illuminated when I press ON but it won't set. Any tips on diagnosing?

'97 GC SE 3.3 230K miles