A few months back I noticed a small mark about 6mm long on the vertical chassis tube by the lower front wishbone mount, this mark developed into a crack about 20mm long propagating from the weld where the lower front wishbone mount is welded to the tube.
Pictures below, showing what to look for.

Area circled is where the cracks are, this is RH side but check both sides of car.

Picture from behind the wishbone mount.

Picture from in front of wishbone mount.
Mine is on the right hand, drivers, side, but since finding mine a number of other cars have been found to have similar cracks either on the right hand side or left hand side or in one instance both sides. All the M3W’s seen with cracks to date are cars delivered in 2013. Depending on the light the cracks can be difficult to see, alternatevly rub your fingernail over the area to feel for any ridge.
Morgan had not seen this issue before and they have designed a new lower front wishbone mount, which has been fitted to my car. Pictures below

Picture from behind the wishbone mount.

Picture from in front of wishbone mount.
MMC’s response has been very good; from the initial contact with the problem they designed, procured and fitted the new lower front wishbone mounts to both sides within 3½ weeks.
I suggest you check your chassis in this area, if in any doubt contact your dealer.