Charles Schwab's Rachel Dashiell examines warning signs beneath the market as the S&P 500 (SPX) tests key support, with weakness in tech and momentum pointing to a possible move toward 7,600. She breaks down JPMorgan Chase (JPM), where a potential head-and-shoulders pattern puts the $322 support level in focus. Caterpillar (CAT) is also breaking key technical levels, with $661 emerging as the next support to watch.