Swissair was in communications with the ground throughout the problem and almost to the crash. The Malaysia Air flight was completely silent.
“...and almost to the crash. “
You like to be annoying don’t you?
5.56mm
IIRC The fire was traced back to the thin insulation on the In Flight Entertainment System rubbing on mounting brackets shorting out, causing sparks that caught the Cabin Roof sound proofing insulation on fire.