So, finally, the bearings gave out, I broke down and opened it up. Someone else on the internet had a review, and said just 4 screws to get to the fan. Must have been a different model, I had to go through 11 of them. Detailed here:
P1070407a.JPG
And it's a nice charger, 4-10-20-40 amps ! (12V, several different battery chemistrys)
P1070407a.JPG
And it's a nice charger, 4-10-20-40 amps ! (12V, several different battery chemistrys)