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Try putting some plumbers tape on your cap threads and then tightening it.
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On PVC? I doubt it will help much.
Those pipes don't look like you used PVC cement, at least the stuff I've used. Did you use primer as well?
Also I'd check the gearbox clamps. IME they tended to leak ever so slowly. My old system bleed away about 3/4 an inch a week until I replaced them with better clamps. The problem was they clamped really tight, but not evenly and some coolant slipped by under the actual box part.