Well, I've found something that might have been causing the issues with the DEC axis. There was a piece of paper at the bottom of the casing, and the grease here is very sticky, brown and quite hard. Photo 1 shows this.
There's quite a bit of clean grease everywhere else, and in the cavity at the top of the DEC shaft there's a lot, even though there are no moving parts here. Makes me think it's almost like a backup supply or something. Photo 2 shows this.
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