The EPR will less than 1.00 on descent.
The PT2 probe is located on the outboard side of the pylon. Left side for #1 & #2, right side for #3 & #4.
I've worked on the classics quite a bit, I believe I even worked N481EV, back in the day, and I've never heard of the '#6 throttle position'. He may have been referring to the index markings on the pedestal which are used by maintenance to mark throttle positions. 6 would have the throttle standing straight up, but nowhere near their max travel of about 11 or 12 (as I recall).
Interesting, according to the FDR graphic, the engines were stuck around the 1.15 - 1.21 range. This the 'bleed-shift' range (on the ground). As I recall, a JT9-7(x) that won't make power, but still has an increasing EGT, has not had 'bleed-shift'.
Bleed-shift is controlled on the engine independently of the other engines, except that one of th bleed controllers looks at air/ground logic. I just don;t remeber enough about chapter 75 on the JT9 to work it through my head any further.
When seconds count...the police are minutes away.