In general, in circuit readings are not worth doing. If you isolate one leg of the cap in question, you know that your resultant data will be as valid as the test equipment you used to make the reading. Which leads to the fact that the capacitance scales on your DMM are probably not going to tell you anything at all about whether the cap is leaky or not. You need the capability to test for leakage at rated voltage to get a clear picture.
Leave it alone unless you have a *definite* problem you are troubleshooting.
Desoldering an pulling a leg, and then reinserting and resoldering fully qualifies as amp abuse, way more than grueling long hours of playing.
If anything, bending solid wire tends to crack and weaken it, and that´s what component legs are.
Also solder heat is way higher than even the hottest chassis, so only do it IF really needed, as while actual servicing.