From FreeSpace Wiki
Special-check
Mike K.'s special training sexp. Returns a boolean value. Takes 1 argument as follows:
0: Ship "Freighter 1" is aspect locked by the player
1: Player has fired Interceptor#Weak at Freighter 1
2: Ship "Freighter 1", subsystem "Weapons" is aspect locked by the player
3: Apply 10 points of damage to player's forward shields (action operator)
4: Player's front shields are nearly gone
5: Quickly recharge player's front shields (action operator)
6: Reduce all shield quadrants except front to 0 (action operator)
7: Front shield quadrant is near maximum strength
8: Rear shield quadrant is near maximum strength
9: Reduce left and right shield quadrants to 0 (action operator)
10: Player has fewer than 8 missiles left
11: Player has 8 or more missiles left
12: Player has fewer than 4 missiles left
13: Reduce front shield quadrant to 0 (action operator)
100: Player is out of countermeasures
2000: Training failed