23. A bronze bearing liner with a lead-tin flashing has a milky-white color over most of its surface and some areas of exposed bronze. The white coloring indicates __________.

The milky-white discoloration indicates water contamination of the lubricating oil system. This is due to water forming an emulsion with the oil, which leaves whitish deposits on the bearing surface, particularly affecting the lead-tin overlay. Proper break-in wear and relocation of the overlay flashing would not produce this color, and improper break-in typically results in localized damage, not a uniform discoloration.