To test for a suspected large refrigerant leak from an R-22 refrigeration system in an enclosed area, how should this be done?

Correct Answer: Option B — apply a soap solution to fittings seen to have oil residue

Refrigerant oil leaks leave an oily residue at connection points. Applying a bubble-forming soap solution directly to these contaminated areas is the standard marine practice for pinpointing large leaks under pressure safely and effectively.