The pump has a drip out of the weep hole.
If the shaft isn't scored/worn, these pumps can easily be rebuilt by replacing the seals and the bearings.
If youre handy and have access to an arbor press (or very large bench vise) ..... the only 'problem' will be setting up the clearances between the bearings and seals; so, measure carefully using 'wire gages' to obtain the as-installed clearance dimensions. Some Yanmar water pumps sometimes require these special 'clearances' ... so measure before you disassemble.
The bearings and seals can be obtained through common industrial bearing national distributorships such as: Bearings Inc. or Callahan Inc. (every large town in industrial/farming areas usually has both of them).
If you KNOW how to remove such bearings and seals, just take them to such distributorships and have them do the measuring .... or identify the parts by their indicated ID stamped on the body of the part (Yanmar, etc. doesn't make bearings and seals!).
If the shaft is slightly scored or worn, you can consider to 'dress' the shaft and install new bearings and seals to the new dimensions .... if you know how to 'set up' a press fit / interference fit (take careful note of the 'clearances' between
bearings and seals when disassembling. The smaller Yanmar distributors and authorized mechanics (usually at larger marinas) sometimes
can do this for you; but, at always horrendous
Another (much cheaper) source for repair would be your local automotive machinist (every moderate sized town has one) - you ID, purchase and take the new bearings and seals with you. Will be a bargain if the shaft isn't scored/worn.
... material cost for both seals (water and oil seals)will be about ≈$30.00 from an industrial distributor; you might as well change the bearings 'while you're at it'.
About $60-80 for all the needed parts, an additional ≈$75.00 for an automotive machinist to do the 'pressing' and set up .... or you could simply throw about $450 towards a new pump.