fan runs constantly.
I have the same problem. recently installed Fusion drive array and now the fan runs constantly. Last three digits are 66E. I have done numerous smc and pram resets. no luck.
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Check your reassembly - you may have missed connecting a sensor. (many problems fixed by finding connectors that "seemed" or "looked" square and complete but were loose, or not locked) .. you could run AHT expanded mode to see if you have a blown sensor.
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2.53 GHz Core 2 Duo (P8700)
Intro Date: June 8, 2009 Disc Date: April 13, 2010
Order No: MB991LL/A Model No: A1278 (EMC 2326*)
Subfamily: Mid-2009 13" Model ID: MacBookPro5,5
Std RAM: 4 GB Std VRAM: 256 MB
Std Storage: 250 GB (5400 RPM) Std Optical: 8X DL "SuperDrive"
by oldturkey03