Turn on the fresh water. Look at the condition of the sink. If the drain leaks you'll see it. There should be. Look in the pantry lockers and examine for evidence of roach infestation.
Food stored in boxes or cellophane bags are roach diners.
All food must be kept in sealable containers. Look under the Nav desk. If it's neat, that's good. Look at the electrical panel. If modifications have been made, and they frequently are, you'll see plastic tape labels.