Arcsine(1,900/32,000)=3.4 degrees.
Simultaneously the speed must be reduced from 180 kt to 137 kt which, in terms of energy, is equivalent to 600 ft height, i.e.:
Arcsine(2,500/32,000)= 4.5 degrees.
And if you want to be stabilized by 1000 ft it is:
Arcsine(1500/12,000)=7,2 degrees.