Fixes fixing fire alarms (#996)

code/game/machinery/firealarm.dm

@@ -153,6 +153,21 @@
 		return
 
 	if(panel_open)
+
+		if(istype(W, /obj/item/weapon/weldingtool) && user.a_intent == INTENT_HELP)
+			var/obj/item/weapon/weldingtool/WT = W
+			if(obj_integrity < max_integrity)
+				if(WT.remove_fuel(0,user))
+					to_chat(user, "<span class='notice'>You begin repairing [src]...</span>")
+					playsound(loc, WT.usesound, 40, 1)
+					if(do_after(user, 40*WT.toolspeed, target = src))
+						obj_integrity = max_integrity
+						playsound(loc, 'sound/items/Welder2.ogg', 50, 1)
+						to_chat(user, "<span class='notice'>You repair [src].</span>")
+			else
+				to_chat(user, "<span class='warning'>[src] is already in good condition!</span>")
+			return
+
 		switch(buildstage)
 			if(2)
 				if(istype(W, /obj/item/device/multitool))
@@ -190,6 +205,7 @@
 						if(buildstage == 1)
 							if(stat & BROKEN)
 								to_chat(user, "<span class='notice'>You remove the destroyed circuit.</span>")
+								stat &= ~BROKEN
 							else
 								to_chat(user, "<span class='notice'>You pry out the circuit.</span>")
 								new /obj/item/weapon/electronics/firealarm(user.loc)
@@ -230,9 +246,10 @@
 /obj/machinery/firealarm/deconstruct(disassembled = TRUE)
 	if(!(flags & NODECONSTRUCT))
 		new /obj/item/stack/sheet/metal(loc, 1)
-		var/obj/item/I = new /obj/item/weapon/electronics/firealarm(loc)
-		if(!disassembled)
-			I.obj_integrity = I.max_integrity * 0.5
+		if(!(stat & BROKEN))
+			var/obj/item/I = new /obj/item/weapon/electronics/firealarm(loc)
+			if(!disassembled)
+				I.obj_integrity = I.max_integrity * 0.5
 		new /obj/item/stack/cable_coil(loc, 3)
 	qdel(src)