Doni, Techwiz, Sman and others will have a better understanding, but I think the issue was whether some language from the preamble applied in in the body of claim 5, as Mark Gurries argued. It looks like they solved the issue by importing the word "media" into claim 13.I would think this would be a positive change.

See below:

5. THE CLAIM 5 PREAMBLE REQUIRES THE PARTICULAR STRUCTURAL
RELATIONSHIP BETWEEN THE "RECORDiNG MEDIUM CHIP" AND THE "HAND
HELD DEVICE" TO PROVIDE THE FUNCTION OF "VERIFYING THE INTEGRITY OF
MEMORY" [...] SUCH THAT THE FLASH MEMORY IS SUlTABLE FOR RECORDING
VOICE MESSAGES" BE A MEDIA TEST.

6. NO LIMITATION IS IMPORTED FROM THE '737 SPECIFICATION THROUGH AN
INTERPRETATlON OF THE CLAIM 5 "MEMORY INTEGRlTY TEST" LIMITATlON TO
REQUIRE A MEDIA TEST.