Water pump in 92 Bonne

Last week I noticed the engine coolant leaking under the my 92 bonne. It was coming from under the water pump area (But no hose was visibly leaking). I rushed it to the dealer. Then after pressure testing it, there was no leak. It stooped leaking for the past 4 days. Very strange behavior.

Has anybody on this forum experienced this "One time" water pump leak. It could be that a seal went out of shape, then back in shape. Is this the beginning of a water pump failure. Your opinion is greatly appreciated. Thanks!