'glad rag' said above: (lovely use of 'may' BTW)
"of course there may well be NO evidence of B model overheating as the testing for this variant may have been ****canned either due to being another inconvenient truth or they just never got round to it ... "
Page 45 of same PDF quoted above:
"• The following details discoveries in F-35B flight sciences testing:
- Testing to characterize the thermal environment of the weapons bays demonstrated that temperatures become excessive during ground operations in high ambient temperature conditions. As a result, during ground operations, fleet pilots are restricted from keeping the weapons bay doors closed for more than 10 cumulative minutes prior to take-off when internal stores are loaded and the outside air temperature is above 90 degrees Fahrenheit. Time with the weapons bay doors closed in flight is currently not restricted."