(Note these were errata applied to 2nd printing, listing them here for anyone with 1st printing)
P23, Engine Hit
Add sentence before "A second Engine Hit critical destroys.."
“The ’Mech will gain heat from this critical hit the first End Phase it took the Engine Hit if it fired its weapons in the Combat Phase of that turn.”
P23, MP Hit
“The affected unit loses half of its current Move and TMM, rounding normally (to a minimum Move loss of 2 inches and TMM loss of 1).”
Change to
“The affected unit halves its Move and TMM, rounding down. Each MP Hit reduces the MV by a minimum of 2” and TMM by 1, until a minimum MV and TMM of 0. If the affected unit has the JMPS special ability, reduce JMPS# by 1, to a minimum JMPS0.”
p38
Replace 2nd and 3rd paragraphs of Demoralizer with
“During the Combat Phase, the player may select one enemy unit with a valid line of sight and within medium range of this unit to try to intimidate. The Demoralizer unit must make a 2d6 roll, with a target number of 8 + the Demoralizer’s Skill – the Demoralizer’s SZ. Success will intimidate the target. Units that are Intimidated in this fashion subtract 2” from their MV and 1 from their TMM, to a minimum of 2” MV and 0 TMM, and suffer a +1 Target Number modifier for all attacks made against the intimidating unit. The intimidation takes effect in the End Phase of this turn and lasts through the End Phase of the next turn.”