Sector Leaders mostly moved up Wednesday, although impressive volume appeared rarely. Apple (AAPL) is rebounding from its 50-day line. Apple bounced from that line Tuesday as volume climbed 44% above average. The stock on Wednesday added 10.14, or almost 2%, to 671.45. Investors were prodded Wednesday by reports that Apple has started production on a smaller version of its red-hot iPad tablets. Volume, which was running at an above-average pace