V70 hydraulic fluid leak

Hi All,

need some help diagnosing problem.

1998 V70 2.5L (100K miles).

Have aleak somewhere in the hydraulic system.

About 4 weeks ago, clutch pedal press would not allow me to change gear
- pedal stayed depressed.

Checked the brake fluid reservoir and noticed the level was below the
outlet for the clutch master cylinder. Topped up with new fluid and
clutch started to work again.

This weekend again noticed the level was down a bit so topped up again,
however today got the same problem again with the clutch pedal.

No apparent leak on servo, master cylinder, clutch master cylinder or
clutch slave cylinder (internal variety :-( ). There is some fluid
dripping off the bottom of the car, looks like it is from under the ABS
hydraulic modulator but can't detect any fluid when running finger
around bottom of the modulator.

Any ideas on what else to look for - will be dropping it into the
dealer but would like to confirm cause.

Thanks