The head unit is a PM-2, doesn’t look like the batteries have leaked. Will get a friend who knows stuff to have a look but from above doesn’t sound like it’s worth bothering with a repair unless it’s for pennies
Check the tracks on the board the damage should be obvious to see.
All PM2 monitors are now over twenty years old and you will struggle to still find one working well without fault. There is no connectivity to a HR monitor or phone. Not good if you want to see your stats on C2 logbook etc.
The head unit is a PM-2, doesn’t look like the batteries have leaked. Will get a friend who knows stuff to have a look but from above doesn’t sound like it’s worth bothering with a repair unless it’s for pennies