I will give you advice based on memory so no guarantee. The pots can physically go in both ways but only 1 way is correct. If you reverse it, it will work funny.
1. Look at the housing carefully and you will see a #1 stamped on the tin shell. That end should be installed on the board which also has #1 printed.
2. On the bottom, there are 2 pairs of 3 contacts. They are numbered 1, 2, 3 (left side) and 1,2,3 (right side).
3. 1-3 should read approximately 88k - 100k ohms. If you get infinity, then either the resistor board trace has a break, or a bad solder joint, or a broken pin rivet.
4. 1-2, and 2-3 should both have continuity. With slider set in middle position, one side should read low (about 15-20k), the other side should read high (about 75-85k).
5. Now with probes steadily connected to either 1-2 or 2-3, slowly move slider from one end to another. Analog meters are easiest to read motion. Digital meters will be confusing to read because the autoranging feature will probably re-set several times during the length of the travel. Because these are log pots and not linear, you should get steady increase or decrease without breaks although the rate of increase or decrease will not be linear.
As for the capacitors, they should read initially read some resistance and very quickly increase to infinity as it charges up. This may happen quicker than your meter can display with such small caps. Final reading of infinity is normal. Very seldom do these go bad. I do however replace the .15uf electrolytic caps with audio-grade ones while I am in there. 0.15uf is very hard to find but you can use .1uf.