Front lid extended during performance

[Carman]

My colleagues,

  This is what I need to know: 

  As a registered member of the Piano Technicians Guild, what is my official responsibility to advise the owner of a grand piano if I see the front lid extended while the main lid is propped up?   What must I say if they ask me whether the front lid IS or IS NOT designed to tolerate that configuration?
  
  As the original poster of this question, I really appreciate your responses. 
 I would like to hear the opinions of -piano manufacturers- or factory reps as to whether the front lid was -designed- to be extended when the main lid is propped up.

Carman Gentile RPT
Redwood Chapter
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