The recent collapse of subprime auto-lenders Tricolor Holdings and debt-heavy auto-parts company First Brands has raised questions about the health of the credit market. JPMorgan's CEO Jamie Dimon voiced caution over the high-profile crack-ups, saying his "antenna" is up. "When you see one cockroach, there's probably more," Dimon said on the bank's third-quarter earnings call with analysts. JPMorgan had no exposure to First Brands, but it's taking a $170 million hit from the Tricolor bankruptcy.